的外光十二烷 HAWENUMBERI-II CH2: 2962 Vas 2872 Vs CH3:1450as1375s CH2:2926Vs2853 CH2:1465sCH3 : 2962 as 2872 s CH3 : 1450 as 1375 s CH2 : 2926 as 2853 s CH2 : 1465 s 十二烷