Sentence: White powder ; m.p. : 159-160 °C ; IR ( KBr ) : ν = H NMR ( 300 MHz , CDCl 3 ) : δ = 8.28 ( dd , J = 7.9 Hz , J = 1.5 Hz , 1H , H5 ) ; 8.02-7.98 ( m , 4H , 4 × o-CH ) ; 7.73-7.63 ( m , 3H , 2 × p-CH , H7 ) ; 7.56-7.48 ( m , 4H , 4 × m-CH ) ; 7.36 ( dt , J = 7.9 Hz , J = 0.7 Hz , 1H , H6 ) ; 7.10 ( d , J = 8.4 Hz , 1H , H8 ) ; 13 C NMR ( 75.5 MHz , CDCl 3 ) : δ = 169. 
 Section: method