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(R)-HCQ (R)-Hydroxychloroquine Hydroxychloroquine R-Isomer Hydroxychloroquine R-isomer(HCl) 2-[[(4R)-4-[(7-chloroquinolin-4-yl)amino]pentyl]-ethylamino]ethanol Ethanol, 2-[[(4R)-4-[(7-chloro-4-quinolinyl)amino]pentyl]ethylamino]-