1 H NMR ( 300 MHz , CDCl 3 ) 3 . 74 ( s , 3 H ) , 3 . 42 ( s , 2 H ) , 2 . 58 ( q , J = 7 . 5 , 2 H ) , 1 . 49 ( m , 2 H ) , 1 . 28 ( m , 10 H ) , 0 . 87 ( t , J = 7 . 6 , 3 H ) . 13 C NMR ( CDCl 3 ) 172 . 6 , 51 . 3 , 50 . 5 , 49 . 3 , 31 . 5 , 29 . 7 , 29 . 1 , 28 . 9 , 26 . 9 , 22 . 3 , 13 . 7 .