摘要:
The present invention relates to a novel method for the preparation of indocyanine green, the method comprising a step of converting 4-[2-[7-[1,1-dimethyl-3-(4- sulfobutyl)benzo[e]indol-3-ium-2-yl] hepta-2,4,6-trienylidene]-1,1- dimethylbenzo[e]indol-3-yl]butane-1-sulfonic acid to Indocyanine green by treatment with sodium chloride. The present invention also relates to a crystalline form of indocyanine green, pharmaceutical compositions comprising the same, and to methods of using the same as a medicament or a diagnostic agent.