title: 3,3'-[(tert-Butoxy-carbon-yl)aza-nedi-yl]dipropanoic acid.
abstract: The title compound, C(11)H(19)NO(6), is an important inter-mediate for the synthesis of cephalosporin derivatives. The N atom is in a planar configuration. In the crystal, mol-ecules are linked into zigzag layers parallel to (100) by O-H⋯O hydrogen bonds.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Tao
authors.forename: Yu-Feng
authors.initials: YF
authors.lastname: Liang
authors.forename: Xiao-Qiang
authors.initials: XQ
authors.lastname: Guo
authors.forename: Zhi-Hua
authors.initials: ZH
authors.lastname: Mao
authors.forename: Qing-Rong
authors.initials: QR
authors.lastname: Qi