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Folic acid: a water soluable vitamin also known as vitamin B-9, folate, or folacin. It is known more as folate because folic acid is a conjugate of folate.

The IUPAC name is 4-{[(2-amino-3, 4-dihydro-4-oxopteridin-6-yl)methyl]amino} benzoic acid.

Structure: It includes a methyl pterin, p-amino benzoate, and glutamic acid. Here are some images of folic acid.

The formation of tetrahydrofolate (THF) can be described as:

The addition of glutamic acid to the indicated carboxylate to where the residues are currently attached. The the enzyme dihydrofolate (DHFR)reductase reduces the pterin system to make the tetrahydrofolate.