Chén Qǐzhēn 陳啟貞 (fl. late 17th c., 清), self-styled “白沙友人” (“friend from Báishā”). Wrote the 暮春 (late-spring) preface 康熙己未 (1679) to 蔣介繁’s Běncǎo zéyào gāngmù 本草擇要綱目 (KR3ec057). No further biographical detail securely attested; no CBDB record.