title: Crystal structure of 2-methyl-amino-3-nitro-4-p-tolyl-pyrano[3,2-c]chromen-5(4H)-one.
abstract: In the racemic title compound, C20H16N2O5, the pyran ring adopts a shallow envelope conformation, with the stereogenic C atom displaced from the other atoms by 0.273 (2) Å. The dihedral angle between the fused-ring system and the pendant p-tolyl group is 87.62 (7)°. The mol-ecular conformation is consolidated by an intra-molecular N-H⋯O hydrogen bond, which generates an S(6) ring. In the crystal, mol-ecules are linked by C-H⋯O inter-actions, resulting in [010] chains.
authors.affiliation: Department of Physics, Pachaiyappa's College for Men, Kanchipuram 631 501, India.
authors.forename: J
authors.initials: J
authors.lastname: Govindaraj
authors.affiliation: Department of Physics, Presidency College (Autonomous), Chennai 600 005, India.
authors.forename: Y
authors.initials: Y
authors.lastname: AaminaNaaz
authors.affiliation: Organic Chemistry Division, Central Leather Research Institute, Adyar, Chennai 602 020, India.
authors.forename: Jayabal
authors.initials: J
authors.lastname: Kamalraja
authors.affiliation: Organic Chemistry Division, Central Leather Research Institute, Adyar, Chennai 602 020, India.
authors.forename: Paramasivam T
authors.initials: PT
authors.lastname: Perumal
authors.affiliation: Department of Physics, Presidency College (Autonomous), Chennai 600 005, India.
authors.forename: A
authors.initials: A
authors.lastname: SubbiahPandi
keywords: biological activity; chromene derivatives; crystal structure; hydrogen bonding; pyrano[3,2-c]chromenone
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