51292-55-8 Azuleno(6,5-b)furan-2(3H)-one, 6,7-bis(acetyloxy)decahydro-5-hydroxy-4a,8-dimethyl-3-methylene-, (3aR-(3aalpha,4abeta,5beta,6alpha,7alpha,7aalpha,8alpha,9aalpha))- Hymenograndin