10-Hydroxy-1,1,4a,6a,8,12b-hexamethyl-2,3,4,4a,4b,5,6,6a,12,12a,12b,13,14,14a-tetradecahydro-1H-naphtho[2,1-a]xanthen-2-yl acetate AIDS-132576 AIDS132576 NSC626776