Name	Info	Provider	Link
	subscription/membership/fee required	American Chemical Society	https://doi.org/10.1021/acs.jmedchem.7b01769
A1: Pepsin - overview and references	free resource	Guide to Pharmacology	https://www.guidetopharmacology.org/GRAC/FamilyDisplayForward?familyId=726
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:29356535
	free resource	scite Smart Citations	https://scite.ai/reports/29356535