3β-acetoxy-5β,8-etheno-ergosta-9(11),22tdiene-6β,7β-dicarboxylic acid-anhydride

乙酸乙酯

methyl 1,3,8-trioxo-1,3,3a,12c-tetrahydro-4H,8H-4,12b-epoxybenzo[10,1]phenanthro[3,4-c]furan-4-carboxylate

endo 1,7-dimethyl-3,5,10-trioxa-tricyclo[5.2.1.0(2,6)]dec-8-en-4-one