tetrahydrofolic acid

noun
tet·ra·hy·dro·fo·lic acid | \-ˌfō-lik- \

Medical Definition of tetrahydrofolic acid 

: a metabolically active reduced form C19H23N7O6 of folic acid that acts as a coenzyme in the transfer of groups (as a methyl group) containing a single carbon atom in metabolic synthesis (as of purines)

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