89141-50-4 Arsonodithious acid, (4-((4,6-diamino-1,3,5-triazin-2-yl)amino)phenyl)-, bis(2-aminoethyl) ester, dihydrochloride Cymelarsan Cymelarsen Mel Cy Melaminylthioarsenite RM 110 RM-110 melCy melaminylthioarsenate