... Name: cis-1,2,3,6-Tetrahydrophthalic anhydride, Tetrahydrophthalic anhydride, cis-4-Cyclohexene-1,2-dicarboxylic anhydride, THPA.Product No: B1001 CAS No: 935-79-5 /85-43 ... -8Formula: C8H8O3 Formula Weight: 152.16Properties: Soluble in benzene and acetone, etc. Sensitive to moisture. Specific gravity: 1 ... ≥99.0% Chromaticity ≤60# (Pt-Co) Melting Point 100.0±2.0