Abstract: The present invention relates to an impurity in plinabulin or a preparation thereof, and a use thereof. The impurity has the structure as shown in formula I, and can be obtained by means of the oxidative degradation of plinabulin under neutral or acidic conditions, having great significance in the quality control of plinabulin or a preparation thereof.

Abstract: The embodiments of the present disclosure disclose a schedule sharing method, apparatus, and device, the schedule sharing method includes: determining a schedule to be shared after detecting a trigger operation of a first user; and sending the schedule to be shared to a target object based on a share operation triggered the first user. The target object is a page or webpage accessed by a user having an access authority. When a second user views the schedule information of the schedule to be shared through the target object, the authority information of the second user with respect to the schedule to be shared is obtained, so that an operation control matching authority information of the second user is displayed on the page corresponding to the schedule to be shared, thereby allowing the second user to interact with the schedule to be shared through the operation control.

Abstract: The invention provides a bedding structure used for supporting back and neck, which is composed of an adjustment base, a plurality of extension arms and a plurality of support plates. It may only use a rotating motor to drive the mechanical deformation of a lying structure to form an ergonomically sitting structure or a structure between lying and sitting.