Acetic acid, bis[(ethoxycarbonyl)amino]-, 5-[[bis[(ethoxycarbonyl)amino]acetyl]amino]-2,4-bis[[4-[(2-thiazolylamino)sulfonyl]phenyl]azo]-1-naphthalenyl ester, compd. with 4,4'-[[4-(methylamino)phenyl]methylene]bis[N,N-dimethylbenzenamine] monohydrochloride (1:1) NSC337714