title: (E)-3-[2,5-Dioxo-3-(propan-2-yl-idene)pyrrolidin-1-yl]acrylic acid.
abstract: The title compound, C(10)H(11)NO(4), was extracted from a culture broth of Penicillium verruculosum YL-52. The mol-ecular structure is essentially planar, with an r.m.s. deviation of 0.01342 (2) Å for the non-H atoms. In the crystal structure, adjacent mol-ecules are connected into a centrosymmetric dimer through a pair of O-H⋯O hydrogen bonds. The dimers are further extended into a chain by weak C-H⋯O hydrogen bonds.
authors.forename: Fang
authors.initials: F
authors.lastname: Miao
authors.forename: Bao-Fu
authors.initials: BF
authors.lastname: Qin
authors.forename: Li-Zhen
authors.initials: LZ
authors.lastname: Yang
authors.forename: Xin-Juan
authors.initials: XJ
authors.lastname: Yang
authors.forename: Le
authors.initials: L
authors.lastname: Zhou