1. Acyclic aldehydes without other oxygen function (excluding methanal, ethanal)

2. Acyclic aldehydes, without other oxygen function (excl. methanal (formaldehyde) and ethanal (acetaldehyde))

3. Acyclic aldehydes, without other oxygen function (excl. methanal "formaldehyde", ethanal "acetaldehyde" and butanal "butyraldehyde, normal isomer")

4. Acyclic aldehydes, without other oxygen function (excluding methanal (formaldehyde), ethanal (acetaldehyde), butanal (butyraldehyde; normal isomer))

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