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A. Stepien

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Featured researches published by A. Stepien.

Acta Crystallographica Section C-crystal Structure Communications | 1996

X-ray Structure Investigations of Potential β-Blockers. II. 6,7-Dimethoxy-1-phenyl-1,2,3,4-tetrahydroisoquinoline

T. A. Olszak; A. Stepien; M. J. Grabowski; E. Brzezinska

The saturated part of the isoquinoline moiety in the title compound, C17H19NO2, has a twist conformation and the phenyl ring substituent is in an equatorial position. The absolute configuration of the molecule is R and molecules form infinite chains by means of weak hydrogen bonds.

Acta Crystallographica Section C-crystal Structure Communications | 1987

Crystal studies of heterocyclic compounds containing one oxygen and two nitrogen atoms. III. Bis[2-(5-phenyl-1,3,4-oxadiazolyl)methyl] ether

A. Stepien; E. Wajsman; M. J. Grabowski; K. Krakowiak; M. Perrin

Acta Crystallographica Section C-crystal Structure Communications | 1992

Crystal studies of heterocyclic compounds containing one oxygen and two nitrogen atoms. XV. N,N'-Ditosyl-2,3,5,6-tetrahydro-1H,7H-4,1,7-benzoxadiazonine

A. Stepien; E. Wajsman; Andrzej M. Brzozowski; M. J. Grabowski; E. Mikiciuk-Olasik; C. Bavoux

Acta Crystallographica Section C-crystal Structure Communications | 1992

Structural studies of some benzodiazepines. II. Structure of 3-(isopropylamino)-4,5-dihydro-1H-2,4-benzodiazepine hydroiodide (2)

Andrzej M. Brzozowski; A. Stepien; E. Brzezinska; S. Lecocq

Acta Crystallographica Section C-crystal Structure Communications | 1989

Structural studies of some benzodiazepines. I. The structure of 3-(benzylamino)-4,5-dihydro-1H-2,4-benzodiazepine hydrochloride (1)

Andrzej M. Brzozowski; A. Stepien; E. Brzezinska; R. Glinka; C. Bavoux

Acta Crystallographica Section C-crystal Structure Communications | 1989

Crystal studies of heterocyclic compounds containing one oxygen and two nitrogen atoms. X. N,N'-Ditosyl-6,7,8,13-tetrahydrodibenz[b,g][1,4,6]oxadiazonine

A. Stepien; U. Derewenda; M. J. Grabowski; R. Glinka; A. Thozet

Acta Crystallographica Section C-crystal Structure Communications | 1988

Structure of (1α,2α,4α,6α)-3,7-dibenzoyl-3,7-diazatricyclo[4.1.0.02,4]heptane

Andrzej M. Brzozowski; M. J. Grabowski; A. Stepien; Z. Dauter

Acta Crystallographica Section C-crystal Structure Communications | 1987

Crystal studies of heterocyclic compounds containing one oxygen and two nitrogen atoms. IV: N,N'-ditosylperhydro-1,4,6-oxadiazocine

U. Derewenda; A. Stepien; T. A. Olszak; K. Krakowiak; M. Perrin

Acta Crystallographica Section C-crystal Structure Communications | 1992

Tetrabenzo[b,g,k,p][1,10,4,6,13,15]dioxatetraazacyclooctadeca[2,4,5,7,11,13,14,16]octaene (III)

A. Stepien; E. Wajsman; M. J. Grabowski; E. Brzezinska; S. Lecocq

Acta Crystallographica Section C-crystal Structure Communications | 1991

Crystal studies of heterocyclic compounds containing one oxygen and two nitrogen atoms. XVII: N,N'-bis(tosyl)perhydro-1,5,7-oxadiazecine

A. Stepien; M. J. Grabowski; K. Krakowiak; C. Bavoux

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Andrzej M. Brzozowski

University of York

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