27740-15-4 Ludovicin C Naphtho(1,2-b)furan-2,8(3H,4H)-dione, 3a,5,5a,6,7,9b-hexahydro-6-hydroxy-5a,9-dimethyl-3-methylene-, (3aS-(3aalpha,5abeta,6alpha,9bbeta))-