TERPENES OF COMPOSITAE PLANTS. XI: STRUCTURES OF HELIANTRIOLS B₀, B₁, B₂ AND A₁, NEW PENTACYCLIC TRITERPENES FROM HELIANTHUS ANNUUS L. AND CALENDULA OFFICINALIS L.PYREK JS.1979; POLISH J. CHEM.; POL; DA. 1979; VOL. 53; NO 12; PP. 2465-2490; ABS. POL; BIBL. 31 REF.Article

TERPENES OF COMPOSITAE PLANTS. V. SESQUITERPENE LACTONES OF LACTUCA SERRIOLA L. THE STRUCTURE OF 8-DEOXYLACTUCIN AND THE SITE OF ESTERIFICATION OF LACTUPICRIN.PYREK JS.1977; ROCZ. CHEM.; POLSKA; DA. 1977; VOL. 51; NO 11; PP. 2165-2170; ABS. POL. RUSSE; BIBL. 10 REF.Article

TERPENES OF COMPOSITAE PLANTS. VII. MASS SPECTRAL FRAGMENTATION OF 16-SUBSTITUTED TARAXANES, TARAXENES AND PSI -TARAXENES.PYREK JS; BARANOWSKA E.1978; POLISH J. CHEM.; POLAND; DA. 1978; VOL. 52; NO 1; PP. 97-106; ABS. POL.; BIBL. 8 REF.Article

THE REINVESTIGATION ON THE PROPERTIES OF CITROSTANEDIOL AND THE REVISION OF C-4 CONFIGURATION OF UTROSTADIENOL ISOLATED FROM CALENDULA OFFICINALIS L.PYREK JS; SCHMIDT SZALOWSKA A.1977; ROCZ. CHEM.; POLSKA; DA. 1977; VOL. 51; NO 5; PP. 951-958; ABS. POL. RUSSE; BIBL. 23 REF.Article

FULLY UNSATURATED DECAPRENOL FROM BOVINE PITUITARY GLANDSRADOMINSKA PYREK A; CHOJNACKI T; PYREK JS et al.1979; BIOCHEM. BIOPHYS. RES. COMMUNIC.; USA; DA. 1979; VOL. 86; NO 2; PP. 395-401; BIBL. 17 REF.Article

¹³C NMR SPECTROSCOPY OF NATURAL SUBSTANCES. IV: ¹³C NMR STUDIES OF TRACHYLOBANE DITERPENES: COMPLETE CARBON ASSIGNMENTARNONE A; MONDELLI R; PYREK JS et al.1979; ORG. MAGNET. RESON.; GBR; DA. 1979; VOL. 12; NO 7; PP. 429-431; BIBL. 14 REF.Article

NAPHTO- AND ANTHRAQUINONES OF STREPTOMYCES THERMOVIOLACEUS WR-141. STRUCTURES AND MODEL SYNTHESES.PYREK JS; ACHMATOWICZ O JR; ZAMOJSKI A et al.1977; TETRAHEDRON; G.B.; DA. 1977; VOL. 33; NO 6; PP. 673-680; BIBL. 23 REF.Article

WHAT IS MEANT BY THE TERM "BILE ACID".LESTER R; PYREK JS; LITTLE JM et al.1983; AMERICAN JOURNAL OF PHYSIOLOGY: GASTROINTESTINAL AND LIVER PHYSIOLOGY; ISSN 0193-1857; USA; DA. 1983; VOL. 7; NO 2; PP. G107-G110; BIBL. 48 REF.Article

STEROIDS. XXIX. REACTIONS OF SOME STEROIDAL HYDROXYAZIDES. CONTRACTION OF RING BKOCOR M; GUMULKA M; KROSZCZYNSKI W et al.1975; TETRAHEDRON LETTERS; G.B.; DA. 1975; NO 2; PP. 165-166; BIBL. 7 REF.Article

¹³C NMR ANALYSIS OF ANTHRAQUINONES AS MODELS FOR ANTHRACYCLINE ANTIBIOTICS.ARNONE A; FRONZA G; MONDELLI R et al.1977; J. MAGNET. RESON.; U.S.A.; DA. 1977; VOL. 28; NO 1; PP. 69-79; BIBL. 16 REF.Article

NEHIPETOL AND NEHIPEDIOL, FURO-ENDESMANES OF NEPETA HINDOSTANA.PYREK JS; KOCOR M; BARANOWSKA E et al.1976; ROCZ. CHEM.; POLSKA; DA. 1976; VOL. 50; NO 11; PP. 1931-1946; ABS. POL. ANGL.; BIBL. 8 REF.Article

¹³C-NMR ANALYSIS OF DIHYDROGRANATICIN METHYL ESTER. A CASE OF MIXED BIOGENESISARNINE A; CAMARDA L; CARDILLO R et al.1979; HELV. CHIM. ACTA; CHE; DA. 1979; VOL. 62; NO 1; PP. 30-33; BIBL. 10 REF.Article