Hi there, Thank you for all your suggestions and generous help, I tried some methods you guys mentioned and learned something new . I really appreciate it. With Kay's help,(after exclusion of the ice rings he found that the data are P1, not P2(1). ) I got my structure solved, there are four copies in the AU, I cut the high resolution to 2.4, and now the R/Rfree is 0.2254/0.2648, this is not the final result. I'm still working on it. Thank you so much.
Best Regards, Tiantian
