title: 1-{(E)-[4-(4-Meth-oxy-phen-yl)butan-2-yl-idene]amino}-3-methyl-thio-urea.
abstract: Two independent mol-ecules comprise the asymmetric unit of the title compound, C(13)H(19)N(3)OS, which differ in the conformations of the residues linking the thio-urea and the terminal benzene ring, as manifested in the C(m)-C(m)-C(a)-C(a) torsion angles [78.03 (16) and -93.64 (16)°, respectively; m = methyl-ene and a = aromatic]. The dihedral angles [84.40 (4) and 88.28 (5)°] formed between the thio-urea residue and the benzene ring indicate an almost orthogonal relationship. In each thio-urea residue, the N-H hydrogen atoms are anti, and the terminal N-H hydrogen atom forms an intra-molecular N-H⋯N hydrogen bond with the imine-N atom. In each case, the conformation about the imine C=N double bond [1.2812 (17) and 1.2801 (17) Å] is E. In the crystal, the mol-ecules are connected by N-H⋯S hydrogen bonds and these are connected into four mol-ecule aggregates via N-H⋯O hydrogen bonds, which are assembled into a two-dimensional array parallel to (011) via C-H⋯π and π-π inter-actions [ring centroid-centroid distance = 3.8344 (9) Å].
authors.forename: Ming-Yueh
authors.initials: MY
authors.lastname: Tan
authors.forename: Thahira Begum S A
authors.initials: TB
authors.lastname: Ravoof
authors.forename: Mohamed Ibrahim Mohamed
authors.initials: MI
authors.lastname: Tahir
authors.forename: Karen A
authors.initials: KA
authors.lastname: Crouse
authors.forename: Edward R T
authors.initials: ER
authors.lastname: Tiekink