The best replacement for sn1 is e1.

The best alternatives to sn1 are rated as following:
★★★★★  e1
★★★  sn2
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★★  sn2 mechanism
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Your alternative for sn1 is not listed? Suggest!
Speaking about sn1, one probably shouldn't forget about significant sn2.

Other search terms related to sn1 and their ratings are:
★★★★★ significant sn2
★★★ ch3oh
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