More cool zinc15 tricks

Here are questions you can ask. Ideally, work these into a tutorial of some kind:

Natural products = biogenic minus metabolites:

http://zinc15.docking.org/substances/subsets/biogenic.smi:zinc_id,purchasability?~features-contains=202&count=all

A second way of asking the same question:

http://zinc15.docking.org/substances.smi:zinc_id,purchasability?features-contains=203&~features-contains=202&count=all