| 1 | 吖丁啶 | 吖丁啶 | ā dīng dìng | a1 ding1 ding4 | azetidine (chemistry) (loanword) | | |
| 2 | 吖啶 | 吖啶 | ā dìng | a1 ding4 | acridine (antiseptic and disinfectant) | | |
| 3 | 氨吖啶 | 氨吖啶 | ān ā dìng | an1 a1 ding4 | aminoacridine or aminacrine (antiseptic and disinfectant) | | |
| 4 | 胞嘧啶 | 胞嘧啶 | bāo mì dìng | bao1 mi4 ding4 | cytosine nucleotide (C, pairs with guanine G 鸟嘌呤 in DNA and RNA) | | |
| 5 | 吡啶 | 吡啶 | bǐ dìng | bi3 ding4 | pyridine C5H5N (loanword) | | |
| 6 | 啶 | 啶 | dìng | ding4 | idine (chemistry) | | |
| 7 | 嘧啶 | 嘧啶 | mì dìng | mi4 ding4 | pyrimidine C4H4N2 | | |
| 8 | 尿嘧啶 | 尿嘧啶 | niào mì dìng | niao4 mi4 ding4 | uracil nucleotide (U, pairs with adenine A 腺嘌呤 in RNA) | | |
| 9 | 哌啶 | 哌啶 | pài dìng | pai4 ding4 | piperidine (chemistry) (loanword) | | |
| 10 | 哌替啶 | 哌替啶 | pài tì dìng | pai4 ti4 ding4 | pethidine (aka meperidine or Demerol) (loanword) | | |
| 11 | 胸腺嘧啶 | 胸腺嘧啶 | xiōng xiàn mì dìng | xiong1 xian4 mi4 ding4 | thymine nucleotide (T, pairs with adenine A 腺嘌呤 in DNA) | | |