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The Collaborative International Dictionary
Sinapic

Sinapic \Sin"a*pic\, a. (Chem.) Of or pertaining to sinapine; specifically, designating an acid ( C11H12O5) related to gallic acid, and obtained by the decomposition of sinapine, as a white crystalline substance.

Wiktionary
sinapic

a. (context organic chemistry English) relating to sinapic acid or its derivatives