At Level 4, the Alchemist can develop formulae to counterfeit level 3 powers of other Disciplines.
At this level, all formulae also require a drop of vitae from a vampire of a matching clan or from one who already possesses the counterfeited Discipline. For example, to counterfeit Shapechange the Alchemist needs vitae from a vampire with Protean or from a Gangrel. The Gangrel would not have to possess Protean 3, or even have Protean at all; the power is in the Blood, not the specific vampire.
As noted above, this drop does not cost the donor any Health, nor does it convey a Blood Bond. That said, Alchemists generally only get such donations as the result of a major Boon – or because the donor has some truly horrible and dangerous mission they are attempting to inveigle the Alchemist’s coterie into carrying out. These formulae take at least three nights to distill and at least three months to research.