1 HKS 3-{[(2s)-2-amino-2-carboxyethyl]sulfanyl}-5-hydroxy-L-tyrosine 1.000 2 DYS S-[5-(2-aminoethyl)-2,3-dihydroxyphenyl]-L-cysteine 0.857 3 NYS S-{5-[(1r)-2-amino-1-hydroxyethyl]-2,3-dihydroxyphenyl}-L-cysteine 0.818 4 QO2 4,5-dimethylcatechol cysteine 0.727 5 QO8 3,4-dimethylcatechol cysteine 0.727