Missing formula for R-group compounds
CHEBI:33575 is an R-group, it has a formula in ChEBI 1.0 but in ChEBI2.0 formula is set as NULL. This is probably because molfile does not classify this compound as an R-Group.
Need to investigate and fix it accordingly.
Ref: https://chembl-ebi.slack.com/archives/D03HE9U5A4F/p1695655425810709