(1S,2R,10S,11S,14S,15S,17R)-14,17-dihydroxy-2,14,15-trimethyl-5-oxotetracyclo[8.7.0.0^{2,7}.0^{11,15}]heptadeca-3,6-diene-4-carbaldehyde
(1S,2R,10S,11S,14S,15S,17R)-14,17-dihydroxy-2,14,15-trimethyl-5-oxotetracyclo[8.7.0.02,7.011,15]heptadeca-3,6-diene-4-carbaldehyde