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We describe SGC-GAK-1 (11), a potent, selective, and cell-active inhibitor of cyclin G associated kinase (GAK), together with a structurally-related negative control SGC-GAK-1N (14). SGC-GAK-1 is highly selective in a kinome-wide screen, but cellular engagement assays defined RIPK2 as a collateral target. We identified 18 as a potent inhibitor of RIPK2 lacking GAK activity. Together, the chemical probe set of 11, 14, and 18 can be used to interrogate the cellular biology of GAK inhibition.

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