vitamin b9 folic acid molecule. skeletal formula.

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