4-Amino-5-[(3,4,5-trimethoxyphenyl)methyl]-2(1H)-pyrimidinone; 6-amino-5-[(3,4,5-trimethoxyphenyl)methyl]-1H-pyrimidin-2-one; Trimethoprim related compound A; Trimethoprim impurity E [EP]; 2-Desamino-2-hydroxy trimethoprim; Trimethoprim related compound A [USP]; Trimethoprim EP Impurity E; Trimethoprim Impurity 5; 2(1H)-Pyrimidinone,6-amino-5-((3,4,5-trimethoxyphenyl)methyl)