isobutyryl radical

(1-cyclopropyl-3-methyl-2-propan-2-ylbut-1-enyl)cyclopropane

2-methyl-3-propan-2-ylhex-2-en-4-yne

N-(2,4-dimethylpentan-3-ylideneamino)-2,4-dinitroaniline

trimethylsilyl 2,4-dimethyl-3-oxopentane-2-sulfonate