has role has role independent continuant L-phenylalanine L-phenylalaninium An optically active form of phenylalaninium having L-configuration. (1S)-1-carboxy-2-phenylethanaminium L-phenylalanine cation CHEBI:32487 D-phenylalaninium phenylalaninium Saccharomyces cerevisiae metabolite plant metabolite Escherichia coli metabolite