436-45-3 Azuleno(6,5-b)furan-2,6(3H,4H)-dione, 3a,7,7a,8,9,9a-hexahydro-4-hydroxy-3,5,8-trimethyl-, (3R-(3alpha,3aalpha,4alpha,7abeta,8beta,9aalpha))- Geigerin