20082-45-5 5H-7,4-Methenofuro [3,2-c] oxireno[f]oxacycloundecin-5-one,1a,2,3,7,11,11a-hexahydro-8-11a-dimethyl-, (1aS,7R,11aS)- AIDS-154321 AIDS154321 Pseudoneolinderane