vitamin b9 or folic acid molecule. skeletal formula.

vitamin b9 chemical structure formula acid antifolate atomic atoms bifida chemistry composition compound deficiency dihydrofolic dna drawing drug flat folacin folate folic folinic fortified glutamate glutamic homocysteine hypervitaminosis icon leaf leucovorin line methotrexate molecular molecule neural nutrient pregnancy pregnant pteroyl skeletal spina supplement supplementation tetrahydrofolate tube valproic vegetable vitamine