title: A stacked pyrazolo[3,4-d]pyrimidine-based flexible molecule: the effect on stacking of a bulky isopropyl group in comparison with a methyl/ethyl group.
abstract: In the crystal structure of 1,3-bis(4,6-diisopropylsulfanyl-1H-pyrazolo[3,4-d]pyrimidin-1-yl)propane, C(25)H(36)N(8)S(4), the pairs of pyrazolo[3,4-d]pyrimidine rings in the molecule stack as a result of intramolecular pi-pi interactions between the heterocyclic rings. The crystal packing also exhibits an intermolecular C--H...pi interaction between one methyl group of an isopropyl group and a pyrazolo[3,4-d]pyrimidine ring.
authors.affiliation: Medicinal Chemistry Division, Central Drug Research Institute, Lucknow 226 001, India.
authors.forename: Kamlakar
authors.initials: K
authors.lastname: Avasthi
authors.forename: Sheikh M
authors.initials: SM
authors.lastname: Farooq
authors.forename: Diwan S
authors.initials: DS
authors.lastname: Rawat
authors.forename: Ashoke
authors.initials: A
authors.lastname: Sharon
authors.forename: Prakas R
authors.initials: PR
authors.lastname: Maulik