The best replacement for anhydride is anhydrous.

The best alternatives to anhydride are rated as following:
★★★★★  anhydrous
★★★  acetic acid
★★  acetyl chloride
★★  maleic acid

Your alternative for anhydride is not listed? Suggest!
Speaking about anhydride, one probably shouldn't forget about amine.

Other search terms related to anhydride and their ratings are:
★★★★★ amine
★★★★ alcl3
★★ secondary amine
★ ethylene glycol
★ ethylamine
★ aniline
★ propan-2-ol
★ phenol
glycerol
amide
furan
resorcinol
salicylic acid
You have in mind a companion for anhydride and it is not yet here? Propose!



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anhydride
anhydrous
acetic acid