(+)-Tazettine 507-79-9 8H-[1,3]Dioxolo[6,7][2]benzopyrano[3,4-c]indol-6a(3H)-ol, 4,4a,5,6-tetrahydro-3-methoxy-5-methyl-, (3S,4aS,6aR,13bS)- AIDS-160829 AIDS160829 NSC652297 Tazettine