Raltegravir (MK-0518) Raltegravir (MK-0518) Synonyms: N-[(4-Fluorophenyl)methyl]-1,6-dihydro-5-hydroxy-1-methyl-2-[1-methyl-1-[[(5-methyl-1,3,4-oxadiazol-2-yl)carbonyl]amino]ethyl]-6-oxo-4-pyrimidinecarboxamide potassium salt; MK 0518 CAS NO.: 871038-72-1 Formula: C20H20FKN6O5 Weight: 482.51