maleic acid and its Impurities
Maleic acid may be used to form acid addition salts with drugs to make them more stable, such as indacaterol maleate. It is an organic compound. It is the cis-isomer of butenedioic acid. Reference standards of Maleic Acid API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.

![1-[4-[[2-(1-Methylethoxy)ethoxy]methyl]phenoxy]-2- PA STI 059790](https://www.pharmaffiliates.com/pimages/PASTI059790.jpg)
1-[4-[[2-(1-Methylethoxy)ethoxy]methyl]phenoxy]-2-[(1-methylethyl)amino]-1-methylethanol-d5 Fumarate (Bisoprolol Fumarate Impurity)
1-[4-[[2-(1-Methylethoxy)ethoxy]methyl]phenoxy]-2-[(1-methylethyl)amino]-1-methylethanol-d5 Fumarate (Bisoprolol Fumarate Impurity)
Catalogue No.:PA STI 059790
CAS :
NA
Molecular Formula : C22H30D5NO8
Molecular Weight : 446.55