Xiong, F.; Li, X.-K.; Xu, M.; Zhang, S.-P.; Chen, F.-E.; Liao, B.; Hua, H.-J.; He, J.-H. Development of Two Scalable Industrial Process for Cinchona Alkaloid Catalyst Recovery: Application to the Large-Scale Production of (+)-Biotin. ajc 2014, 26, 3659-3660.