| 组 |
zǔ ān suān | histidine (His), an essential amino acid |
| 组 |
Zǔ | surname Zu |
| 组 |
zǔ | to form / to organize / group / team / classifier for sets, series, groups of people, batteries |
| 氨 |
ān | ammonia |
| 酸 |
suān | sour / tart / sick at heart / grieved / sore / aching / pedantic / impractical / to make sarcastic remarks about sb / an acid |