9-N-(N'-Chloroethyl-N'-ethyl-1,4-diamino-butyl)2-methoxy acridine dihydrochloride AIDS-156837 AIDS156837 NSC631197 (HYDROCHLORIDE SALT) N~1~-(2-Chloroethyl)-N~1~-ethyl-N~4~-(2-methoxy-9-acridinyl)-1,4-butanediamine hydrochloride