Template for Electronic Submission to ACS Journals

ubChem uses its ownfingerprint called PubChem subgraph fingerprints.

If you follow the [link](ftp://ftp.ncbi.nlm.nih.gov/pubchem/specifications/pubchem_fingerprints.pdf) you see the fingerprint key, and this is confusing. How would you represent a molecule with on carbon, 1 oxygen and 2 hydrogen (formaldehyde) when the lowest C count is 2, and H count is 4

Item URL: 
https://hypothes.is/a/IO-RSgmQEeeckftPLt6gXg