[1]Patent:US4786734,1988,A,
[2]Patent:US4789393,1988,A,
[1]Patent:US4786734,1988,A,
[2]Patent:US4789393,1988,A,
[1]Patent:US4789393,1988,A,
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[2]TetrahedronLetters,1993,vol.34,p.2875-2878
[1]Patent:US4786734,1988,A
[2]Patent:US4789393,1988,A
[1]Patent:US4789393,1988,A
[1]Patent:US4786734,1988,A
[1]CurrentPatentAssignee:JIANGSUPIONEERPHARMACEUTICAL-CN113214147,2021,ALocationinpatent:Paragraph0018-0025