2-((5-Methoxy-2-vinyl-1,2-dihydro-1-naphthalenyl)methoxy)-4-methyl-5-phenyl-1,3,2-oxazaphospholidine 2-sulfide AIDS-131519 AIDS131519 Methyl 5-(((4-methyl-5-phenyl-2-sulfido-1,3,2-oxazaphospholidin-2-yl)oxy)methyl)-6-vinyl-5,6-dihydro-1-naphthalenyl ether NSC623960