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[7] Xia, M., et al. “DL-Mandelic acid exhibits high sperm-immobilizing activity and low vaginal irritation: A potential non-surfactant spermicide for contraception.” Science Direct, 2020, reader.elsevier.com/reader/sd/pii/S0753332220302961?token=063F3CA5FE829FE276755EF2EE8152EBC11B2906592153330A395D73878C354BC3E701A06960C98C04FA57B0D8AB401A . Accessed August 2023.