The best replacement for disulfide is disulphide.

The best alternatives to disulfide are rated as following:
★★★★★  disulphide
  molybdenum disulfide

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Speaking about disulfide, one probably shouldn't forget about sulfur.

Other search terms related to disulfide and their ratings are:
★★★★★ sulfur
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disulfide
disulphide
molybdenum disulfide