The best replacement for thiol is sulfhydryl.

The best alternatives to thiol are rated as following:

★★★★★	sulfhydryl
★★★★	mercapto

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Speaking about thiol, one probably shouldn't forget about maleimide.

Other search terms related to thiol and their ratings are:

★★★★★	maleimide
★★★	dtt

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Scale is based on the average worldwide traffic of thiol in all years. Click on graph for more.

thiol

sulfhydryl

mercapto