dopa(+-)-3-(3,4-dihydroxyphenyl)alanine(+-)-dopa(R,S)-dopa3',4'-dihydroxyphenylalanine3-hydroxy-DL-tyrosine3-hydroxytyrosineDL-3,4-dopaDL-beta-(3,4-dihydroxyphenyl)alanineDL-dihydroxyphenylalanineDL-dioxyphenylalaninebeta-(3,4-dihydroxyphenyl)-DL-alpha-alaninedl-beta-(3,4-dihydroxyphenyl)-alpha-alanine