CH3 CH3 w CHCH2CHCH CH CHCH2 CH3 c sec-Butyl Isobutyl CH3 (sec-Bu) tert-Butyl (t-Butyl or t-Bu) C2004 Thomson-Brooks/Cole CH3 CH3 CH;CHCH2CH2 CH3-C-CH2专 CH3CH2一 cx CHs CH3 CH3 [sopentyl,also called Neopentyl tert-Pentyl,also called isoamyl (i-amyl) tert-amyl (t-amyl) @2004 Thomson-Brooks/Cole