The best replacement for fecl3 is alcl3.

The best alternatives to fecl3 are rated as following:
★★★★★  alcl3

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Speaking about fecl3, one probably shouldn't forget about phenol.

Other search terms related to fecl3 and their ratings are:
★★★★★ phenol
★★ salicylic acid
★★ phenols
★ carboxylic acids
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