发明授权
US4320056A Certain thia-diazatricyclo[3,3,3,0.sup.8,11 ]tridecanes, and their preparation 失效
某些二氮杂三环[3,3,3,08,11]十三烷及其制备方法

Certain thia-diazatricyclo[3,3,3,0.sup.8,11 ]tridecanes, and their
preparation
摘要:
A process is disclosed for producing d-biotin from L or DL-cystine ester via novel intermediates.
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