. . "C0000378" . "3,4-threo-DOPS"@en . . . "Droxidopa"@en . . "D015103" . "Droxidopa"@en . "threo-DOPS"@en . . "DL-threo-3,4-Dihydroxyphenylserine"@en . . "L-Tyrosine, beta,3-dihydroxy-, threo-"@en .