Synthesis of methyl ether analogues of sildenafil (Viagra®) possessing tyrosinase inhibitory potential

Khalid Mohammed Khan^*, Ghulam Murtaza Maharvi, Shahnaz Perveen, Mahmud Tareq Hassan Kan, Raid J. Abdel-Jalil, Syed Tasadaque Ali Shah, Miriam Fecker, Muhammad Iqbal Choudhary, Atta-ur-Rahman, Wolfgang Voelter