research papers
Molecules of 2-ethyl-1-[5-(4-methylphenyl)pyrazol-3-yl]-3-(thiophene-2-carbonyl)isothiourea, formed by reaction of S,S-diethyl 2-thenoylimidodithiocarbonate with 5-amino-3-(4-methylphenyl)-1H-pyrazole, form hydrogen-bonded ribbons in which centrosymmetric (4) and (6) rings alternate.
research papers
The molecular components of a solvated 7H-pyrimido[4,5-b][1,4]diazepine derivative are linked by hydrogen bonds to form sheets containing four types of hydrogen-bonded ring.
research papers
Two independent - stacking interactions link the molecules of (E)-3-{4-[(7-chloroquinolin-4-yl)oxy]-3-methoxyphenyl}-1-(4-methylphenyl)prop-2-en-1-one, but hydrogen bonds are absent from the structure.
research papers
In a substituted pyrazolo[1,5-a][1,3,5]triazine, centrosymmetric dimers generated by C-HO hydrogen bonds are linked into chains by a - stacking interaction.