The best replacement for reagent is reactant.

The best alternatives to reagent are rated as following:
★★★★★  reactant
★  laboratory grade
★  om
★  catalyst
★  limiting reactant
★  solvent
★  lab grade
★  agent
★  technical grade
★  benedict\u0027s reagent
  trizol
  pcc
  benedict's reagent
  excess reagent

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

Other search terms related to reagent and their ratings are:
★★★★★ benzaldehyde
★★★★ alcohols
★★★ ester
★★★ aldehyde
★★★ carbon dioxide
★★ formaldehyde
★ nitrile
★ lactose
★ aldehydes
★ acetone
an aldehyde
ketone
1-butanol
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Google Trends

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reagent
reactant
laboratory grade