prov:value
| - olide A); or R1 is ???O-acetyl, R2 and R3 cooperate to form an epoxide, R6 is a carbonyl oxygen and R6??? is not present, R7 is hydroxy, R8 is H, R11 is ???O-acetyl, R12 is ???O-acetyl, R15 is hydroxy, R16 is H, R18 is methyl, R19 is methyl, R21 is methyl, R26 is hydroxy, R26??? is methyl, R27 is a carbonyl oxygen and R27??? is not present, R28 is methyl, X is O, and there is a double bond between
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