The stereoisomer D-phenylalanine (DPA) is usually made by traditional organic synthesis, possibly as one enantiomer or like a component of your racemic mixture. It doesn't be involved in protein biosynthesis although it is found in proteins in smaller amounts - specially aged proteins and foodstuff proteins which have been processed. https://ppap-hcl-buy34542.thecomputerwiki.com/5222812/a_review_of_deschloroketamine