Xiaoman Guo

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Two diterpenoids with an unprecedented diterpene carbon skeleton, cinnamomols A (1) and B (2), were isolated from the leaves of Cinnamomum cassia. 1 and 2 feature a cage-like, rigid, 5/5/5/5/5/6-fused hexacyclic ring system. The structures of 1 and 2 were established by extensive spectroscopic techniques and single-crystal X-ray diffraction, and their(More)
Through in-depth analysis of the fitting interpolation principle combining with characteristics of piston surface structure, the mathematical model of the type line fitting interpolation is established, which is applicable to vertical line and line of the different cross section shape. In order to improve the machining efficiency and precision, using(More)
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