Holzgrabe, U; Brandt, W (2003). „Mechanism of action of the diazabicyclononanone-type kappa-agonists”. Journal of medicinal chemistry. 46 (8): 1383—9. PMID12672238. doi:10.1021/jm0210360.
Kögel, B; Christoph, T; Friderichs, E; Hennies, HH; Matthiesen, T; Schneider, J; Holzgrabe, U. (1998). „HZ2, a Selective Kappa-Opioid Agonist”. CNS Drug Reviews. 4 (1): 54—70. doi:10.1111/j.1527-3458.1998.tb00041.x.
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ncbi.nlm.nih.gov
Siener, T; Cambareri, A; Kuhl, U; Englberger, W; Haurand, M; Kögel, B; Holzgrabe, U (2000). „Synthesis and opioid receptor affinity of a series of 2, 4-diaryl-substituted 3,7-diazabicylononanones”. Journal of medicinal chemistry. 43 (20): 3746—51. PMID11020289.
Holzgrabe, U; Cambareri, A; Kuhl, U; Siener, T; Brandt, W; Strassburger, W; Friderichs, E; Englberger, W; Kögel, B (2002). „Diazabicyclononanones, a potent class of kappa opioid analgesics”. Farmaco (Società chimica italiana : 1989). 57 (7): 531—4. PMID12164207.
Holzgrabe, U; Brandt, W (2003). „Mechanism of action of the diazabicyclononanone-type kappa-agonists”. Journal of medicinal chemistry. 46 (8): 1383—9. PMID12672238. doi:10.1021/jm0210360.