2-[2-Acetylamino-4-[N,N-bis(methoxycarbonylmethyl)amino]phenylazo]-6,7-dichlorobenzothiazole

2,2'-[3-Acetylamino-4-(6,7-dichlorobenzothiazol-2-ylazo)phenylimino]bis(acetic acid methyl) ester