(1R,8S)-3-Oxo-2-oxa-tricyclo[6.2.2.01,5]dodeca-4,6,9,11-tetraene-9,10-dicarboxylic acid dimethyl ester

(6R,6aS,7S,10R,10aR,10bR)-dimethyl 2-oxo-2,6,6a,7,10,10a-hexahydro-7,10-epoxy-6,10b-ethenobenzo[6,7]cyclohepta[1,2-b]furan-8,9-dicarboxylate

呋喃

3-苯基异恶唑

dimethyl 3-phenyl-1,2-oxazole-4,5-dicarboxylate