1,2a-Methano-2aH-cyclopropa(b)naphthalene-6-propanoic acid, decahydro-1,6-dimethyl-5-(1-methylethenyl)-, (1R-(1alpha,1abeta,2aalpha,5beta,6alpha,6aalpha,7beta))- 138950-24-0 3,4-Secotrachylobanoic acid