碎片离子峰 57 43 M=86 29 71 86M 304050 60708090 H3C-CH2-CH2-CH2-H3C-C- CH357 CH3 H3C-C H2-CH2 H3C-C H-CH3 43 23:13:12 23:13:12 碎片离子峰 29 43 57 71 86 M 30 40 50 60 70 80 90 H3C CH2 C H2 C H2 H3C C CH3 C H3 57 H3C C H2 C H2 H3C C H C H3 43 M=86