2517-52-4 AIDS-125633 AIDS125633 Aspidofractinine-3-carboxylic acid, 1-formyl-17-methoxy-, methyl ester, (2.alpha.,3.beta.,5.alpha.)- Methyl 1-formyl-17-methoxyaspidofractinine-3-carboxylate NSC78734 Refractin Refractine Vellosine