(1300−1400)cm−1(1300-1400) \mathrm{cm}^{-1}(1300−1400)cm−1
(1700−1730)cm−1(1700-1730) \mathrm{cm}^{-1}(1700−1730)cm−1
(1600−1650)cm−1(1600-1650) \mathrm{cm}^{-1}(1600−1650)cm−1
(1500−1600)cm−1(1500-1600) \mathrm{cm}^{-1}(1500−1600)cm−1