
| Examples: | Cf. Rule |
| 3-(Formylmethyl)heptanedial preferred to | |
| 3-(2-Oxoethyl)heptanedial | C-303.3 |
| 7-Thioformylheptanoic acid preferred to | |
| 8-Thioxooctanoic acid | C-531.3 |



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