Acalabrutinib Impurity 4

Chemical Name: (2R)-2-amino-3-[(E)-3-[(2S)-2-[8-amino-1-[4-(2-pyridylcarbamoyl)phenyl]imidazo [1,5-a]pyrazin-3-yl]pyrrolidin-1-yl]-1-methyl-3-oxo-prop-1-enyl]sulfanyl-propanoic acid

Synonym: 2,2'-(Piperazine-1,4-diyl)bis(6,7-diMethoxyquinazolin-4-amine)