5-cyclopropyl-6-cyclopropylmethoxy-pyrazine-2-carboxylic acid 、
Acetic acid 3-methyl-pyrrolidin-3-yl ester 以isolated (30 mg, 40%) as off white sticky solid的产率得到acetic acid 1-(5-cyclopropyl-6-cyclopropylmethoxy-pyrazine-2-carbonyl)-3-methylpyrrolidin-3-yl ester