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![3-oxa-6-azabicyclo[2.2.1]heptan-5-one](http://zinc12.docking.org/img/rings/139722.gif)
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![3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxole](http://zinc12.docking.org/img/rings/20426.gif)
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![3a,5,6,6a-tetrahydrofuro[2,3-d]oxazole](http://zinc12.docking.org/img/rings/245134.gif)
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![3a,5,6,6a-tetrahydrofuro[2,3-d][1,3]dioxole](http://zinc12.docking.org/img/rings/3011.gif)
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![1,3,3a,4,6,6a-hexahydrofuro[3,4-c]furan](http://zinc12.docking.org/img/rings/169772.gif)
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![2,3,3a,4,5,6a-hexahydrofuro[2,3-b]furan](http://zinc12.docking.org/img/rings/13702.gif)
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![2,3,3a,5,6,6a-hexahydrofuro[3,2-b]furan](http://zinc12.docking.org/img/rings/169311.gif)
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![3,3a,4,5,6,6a-hexahydro-1H-furo[3,4-c]pyrrole](http://zinc12.docking.org/img/rings/370.gif)
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![4,7-dioxabicyclo[3.2.1]octane](http://zinc12.docking.org/img/rings/196065.gif)
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![4,8-dioxabicyclo[3.2.1]octane](http://zinc12.docking.org/img/rings/52236.gif)
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![3,3a,4,5,6,6a-hexahydro-2H-cyclopenta[b]furan](http://zinc12.docking.org/img/rings/67132.gif)
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![3,3a,4,6a-tetrahydro-2H-cyclopenta[b]furan](http://zinc12.docking.org/img/rings/40075.gif)
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![3,3a,6,6a-tetrahydro-2H-cyclopenta[b]furan](http://zinc12.docking.org/img/rings/484442.gif)
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![8-oxabicyclo[3.2.1]octane](http://zinc12.docking.org/img/rings/101596.gif)
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![3,6,8-trioxa-7$l^{5}-phosphabicyclo[3.3.0]octane 7-oxide](http://zinc12.docking.org/img/rings/94768.gif)
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![3a,4,6,6a-tetrahydrofuro[3,4-d][1,3,2]dioxathiole 2-oxide](http://zinc12.docking.org/img/rings/551303.gif)
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![4,6,8-trioxa-7$l^{5}-phosphabicyclo[3.3.0]octane 7-oxide](http://zinc12.docking.org/img/rings/195976.gif)
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![7-thioxo-3,6,8-trioxa-7$l^{5}-phosphabicyclo[3.3.0]octane](http://zinc12.docking.org/img/rings/592652.gif)
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![3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxol-2-one](http://zinc12.docking.org/img/rings/597188.gif)
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![3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxole-2-thione](http://zinc12.docking.org/img/rings/145334.gif)
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![3,3a,6,6a-tetrahydro-2H-furo[3,4-b]furan-4-one](http://zinc12.docking.org/img/rings/13704.gif)
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![3a,4,5,6a-tetrahydro-3H-furo[2,3-b]furan-2-one](http://zinc12.docking.org/img/rings/76047.gif)
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![3a,5,6,6a-tetrahydro-3H-furo[3,2-b]furan-2-one](http://zinc12.docking.org/img/rings/233395.gif)
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![4a,6,7,7a-tetrahydro-4H-furo[3,2-d][1,3]dioxine](http://zinc12.docking.org/img/rings/20364.gif)
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![7-oxa-3-azaspiro[4.4]nonane](http://zinc12.docking.org/img/rings/260701.gif)
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![6-oxaspiro[4.4]nonane](http://zinc12.docking.org/img/rings/37348.gif)
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![3,5,7-trioxa-4$l^{5}-phosphabicyclo[4.3.0]nonane 4-oxide](http://zinc12.docking.org/img/rings/366525.gif)
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![3,5,9-trioxa-4$l^{5}-phosphabicyclo[4.3.0]nonane 4-oxide](http://zinc12.docking.org/img/rings/4450.gif)
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![4-thioxo-3,5,9-trioxa-4$l^{5}-phosphabicyclo[4.3.0]nonane](http://zinc12.docking.org/img/rings/253375.gif)
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![1,6-dioxaspiro[4.4]non-3-en-2-one](http://zinc12.docking.org/img/rings/137397.gif)
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![1-oxa-8-azaspiro[4.5]decane](http://zinc12.docking.org/img/rings/26302.gif)
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![2,10-dioxaspiro[4.5]decane](http://zinc12.docking.org/img/rings/480760.gif)
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![2-oxa-8-azaspiro[4.5]decane](http://zinc12.docking.org/img/rings/510747.gif)
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![1-oxaspiro[4.5]decane](http://zinc12.docking.org/img/rings/366652.gif)
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![2,10-dioxaspiro[4.5]dec-8-en-7-one](http://zinc12.docking.org/img/rings/480510.gif)
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![2,6-dioxaspiro[4.5]decan-9-one](http://zinc12.docking.org/img/rings/480831.gif)
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![4,10-dioxabicyclo[5.2.1]decan-3-one](http://zinc12.docking.org/img/rings/148712.gif)
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![1-oxa-9-azaspiro[4.6]undecan-8-one](http://zinc12.docking.org/img/rings/29134.gif)
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![1-oxaspiro[4.5]dec-8-ene-7,10-quinone](http://zinc12.docking.org/img/rings/14491.gif)
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![2,10-dioxabicyclo[7.3.0]dodec-6-ene](http://zinc12.docking.org/img/rings/247272.gif)
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![3,5,7,11-tetraoxa-4$l^{5},6$l^{5}-diphosphabicyclo[6.3.0]undecane 4,6-dioxide](http://zinc12.docking.org/img/rings/228155.gif)
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