Chromotropic Acid
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This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
(4,5-Dihydroxy-2,7-naphthalenedisulfonic Acid), C10H8O8S2· 2H2O 356.33 CAS RN®: 148-25-4., for the anhydrous form—Use a suitable grade.
