FURO[3',4':6,7]NAPHTHO[2,3-D]-1,3-DIOXOL-6(5AH)-ONE, 9-(DIETHYLAMINO)-5,8,8A,9-TETRAHYDRO-5-(4-HYDROXY-3,5-DIMETHOXYPHENYL)-, [5R-(5A,5AB,8AA,9B)]-