YK-4-279 25MG. YK-4-279, CAS: 1037184-44-3, Molecular Formula: C17H13Cl2NO4, Molecular Weight: 366. 2, Purity: greater than or equal to 98% by HPLC, Appearance: White solid, Synonym: 4, 7-Dichloro-1, 3-dihydro-3-hydroxy-3-[2-(4-methoxyphenyl)-2-oxoethyl]-2H-indol-2-one, Size: 25MG