Potent halogenated xanthone derivatives: synthesis, molecular docking and study on antityrosinase activity by Baharuddin, Fatin Farhana, Mad Nasir, Nadiah, Tejo, Bimo Ario, Koh, Soo Peng, Ramakrishnan, Shuruti, Nordin, Nur Qurratu Ain A., Adzahar, Anis Nasuha, Devakrishnan, Pavithren, Mohd Razib, Salsabiilaa