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Butyl group - Wikipedia
异丁基 - 百度百科
Isobutyl | C4H9 - ChemSpider
Isobutyl - ChemistryScore
Meanings of isopropyl, n-butyl, isobutyl, s-butyl and t-butyl and ...
Don't Be Futyl, Learn The Butyls - Master Organic Chemistry
Illustrated Glossary of Organic Chemistry - Isobutyl group
Butyl Group - Introduction, Butyl Structure, Preparation and Uses …
Isobutyl Group - an overview | ScienceDirect Topics
AI for Teachers - Khan Academy