title: Correction: enantioselective synthesis of chiral heterocycles containing both chroman and pyrazolone derivatives catalysed by a chiral squaramide.
authors.affiliation: School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, People's Republic of China. dudm@bit.edu.cn.
authors.forename: Jun-Hua
authors.initials: JH
authors.lastname: Li
authors.forename: Da-Ming
authors.initials: DM
authors.lastname: Du