... B2 2.Excellent quality 3.Delivery quick 4.Competitive price Folic Acid Vitamin B2 Chemical Name: 7,8-Dimethyl-10-[(2S ... ,3S,4R)-2,3,4,5-tetrahydroxypentyl]benzo[g]pteridine-2,4(3H,10H)-dione. ... optical rotation (dried substance)-115~-135°Loss on drying≤ 1.5%Sulphated ash≤ 0.1%Uses: Feed additive ,food additive. ... of validity: In an airtight container,Three years Folic Acid Vitamin B2