| 4-dihydroxyphenyl)- 3-( l-threo-serin |
| (-)-(2S,3R)-2-amino-3-hydroxy-3-(3,4-dihydroxyphenyl)propionic acid |
| droxidopa |
| l-dops |
| l-threo-3-(3,4-dihydroxyphenyl)serine |
| l-threodops |
| 3-dihydroxy- bet (beta-r)-l-tyrosin |
| 3-dihydroxy- bet threo-l-tyrosin |
| threo-dopaserine |
