Macitentan Impurity A Catalogue M102651 CAS 441798-25-0 M.W 560.22 M.F C17H16Br2N6O4S Specifications FAQs Macitentan N-methyl Analog ; N-[5-(4-Bromophenyl)-6-[2-[(5-bromo-2-pyrimidinyl)oxy]ethoxy]-4-pyrimidinyl]-N -methylsulfamide