477-33-8 CROTONIC ACID, 3-METHYL-, 9-ESTER with 9,10-DIHYDRO-9,10-DIHYDROXY-8,8-DIMETHYL- Crotonic acid, 3-methyl-, 9-ester with 9,10-dihydro-9,10-dihydroxy-8,8-dimethyl-2H,8H-benzo(1,2-b:3,4-b')-dipyran-2-one acetate Samidin