Vat Blue 2 是一种靛蓝 (HY-N0335) 衍生物，是一种深蓝色的 5,5'-二溴-4,4'-二氯靛染料 (dye)。
体外研究
Indigo is the parent compound for a series of bromine and chlorine-substituted dyestuffs. Vat Blue 2 has four substituents, two each of chlorine and bromine, but located at different positions.
