| 色 |
sè ān suān | tryptophan (Trp), an essential amino acid |
| 色 |
sè | color / CL:种 / look / appearance / sex |
| 色 |
shǎi | (coll.) color / used in 色子 |
| 氨 |
ān | ammonia |
| 酸 |
suān | sour / tart / sick at heart / grieved / sore / aching / pedantic / impractical / to make sarcastic remarks about sb / an acid |