ammonia dichloroplatinum(2+) 298.956 300.045 BSJGASKRWFKGMV-UHFFFAOYSA-L CHEBI:124988 Cl2H6N2Pt InChI=1S/2ClH.2H3N.Pt/h2*1H;2*1H3;/q;;;;+4/p-2 LINCS:LSM-36449 N.N.Cl[Pt+2]Cl chebi_ontology transition element molecular entity inorganic chloride