title: Methyl 5'-(2-hy-droxy-phen-yl)-4',5',6',7'-tetra-hydro-spiro-[2H-1-benzopyran-2,7'-1,2,4-triazolo[1,5-a]pyrimidine]-3-carboxyl-ate.
abstract: There are two crystallographically independent mol-ecules in the asymmetric unit of the title compound, C(21)H(18)N(4)O(4). The substituted benzopyran portion of one of the independent mol-ecules exhibits disorder [occupancy 0.5248 (18):0.4752 (18)], which was modelled by using two sets of atomic positions and restraints on the chemically equivalent bond lengths and angles. The central, partially saturated pyrimidine rings of both independent mol-ecules were found to assume unsymmetrical half-chair conformations. The hy-droxy-phenyl substituent occupies an equatorial position in both mol-ecules, and is rotated by 55.6 (1)° from the mean plane of the pyrimidine ring in one independent mol-ecule, and by 53.4 (1)° in the other. In the crystal, there are two types of inter-molecular hydrogen bond present: reciprocal N-H⋯N inter-actions join the two crystallographically independent mol-ecules into a dimer and O-H⋯N inter-actions link the dimers into sheets in the ab plane.
authors.affiliation: Faculty of Pharmacy, Comenius University, Odbojarov 10, SK-83232 Bratislava, Slovakia.
authors.forename: Viktor
authors.initials: V
authors.lastname: Kettmann
authors.forename: Jan
authors.initials: J
authors.lastname: Světlík