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【正】 C18H18O6·H2O, Mr = 348. 34, cis-isomer: orthorhombic, Cmc21, a = 16. 421(3), 6 = 11.978(1), c=8. 624(1)(?), V = 1696. 2(?)3, Z = 4, Dc= 1.293 gcm-3, λ(MoKα) = 0. 71073(?), μ = 0. 911cm-1, F (000) = 763, R = 0. 043, Rw = 0. 042 for 769 unique obse