Isopropyl mercaptan is a thiol with the formula C3H8S.

It is a water-white[clarification needed] liquid with an extremely pungent odor resembling skunk spray or rotten eggs.

The pungent smell allows it to be used as an odorizer.

[2] The FDA has approved it for use as a food additive for its flavor.

[3] Another use is as a rubber additive.