Cheat sheets
Short, careful guides for chemists and students. Free to download and print. No account needed.
PDF · 2 pages, A4 · Updated October 2026
The rule of five, Veber's limits, the rule of three and lead-likeness in one place, what each number means, the groups that cause trouble, and the famous drugs that break the rules.
Rules of thumb are guides, not laws. Each sheet says where they stop working. New sheets are added as we write them.
Useful for a class, a lab group or a friend who is starting medicinal chemistry.
On a phone, tapping Facebook opens the Facebook app's post screen with the link already in it: just tap Post. Facebook cannot take your words from a button, so the caption is copied for you to paste.
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