Pyrazinecarboxylic acid, 4,5-dihydro-6-methyl-5-oxo-, methyl ester CAS NO.77168-84-4

1 good quality, better price and bettter service；
2 Timely delivery；
3 100% refunded if parcel is t delivered or poor quality.
We will try to satisfy you upon receipt of your reply. I hope that we can become a long-term cooperative partner.