title: (Z)-3-(1-Hy-droxy-3-oxobut-1-en-yl)-6-nitro-2H-chromen-2-one.
abstract: In the title compound, C(13)H(9)NO(6), the coumarin system has the benzene ring aligned at 0.61 (18)° with respect to the pyrone ring. An intra-molecular O-H⋯O hydrogen bond stabilizes the mol-ecular conformation and a C-H⋯O contact also occurs. In the crystal, weak C-H⋯O inter-actions link the mol-ecules, forming inversion dimers.
authors: Centre for Bioinformatics, School of Life Sciences, Pondicherry University, Puducherry 605 014,  India.
authors: Nishith Saurav
authors: NS
authors: Topno
authors: Venkataswamy
authors: V
authors: Tangeti
authors: H Surya Prakash
authors: HS
authors: Rao
authors: R
authors: R
authors: Krishna