Cuprate(4-),[6-[[(2,3-dichloro-6-quinoxalinyl)carbonyl]amino]-3-[[4-[(2,5-disulfophenyl)azo]-2-hydroxy-5-methylphenyl]azo]-4-hydroxy-2,7-naphthalenedisulfonato(6-)](2,2'-iminobis[ethanol]-N)-,ammonium potassium sodium, compds. with diethanolamine