5-cyclopropyl-6-cyclopropylmethoxy-pyrazine-2-carboxylic acid 、 (2R)-2-amino-2,3-dimethyl-1-butanol 以isolated (20 mg, 14.04%) as off white sticky solid, LC-MS (UV peak area, ESI) 100%, 334.4 (M+H)的产率得到5-cyclopropyl-6-cyclopropylmethoxy-pyrazine-2-carboxylic acid ((R)-1-hydroxymethyl-1,2-dimethyl-propyl)-amide