Two new alkaloids, pipercyclobutanamides A and B, from Piper nigrum

Two new alkaloids, pipercyclobutanamides A and B, from Piper nigrum New Amide Alkaloids from the Roots of Piper nigrum An amide from fruits of Piper nigrum Nigramides A−S, Dimeric Amide Alkaloids from the Roots of Piper nigrum Nigramides A−S, Dimeric Amide Alkaloids from the Roots of <i>Piper </i><i>n</i><i>igrum</i> Isopiperolein B: an alkamide from Piper nigrum Alkaloids from <i>Piper sarmentosum</i> and <i>Piper nigrum</i> Isolation and identification of amides from Piper callosum. Synthesis of pipercallosine and pipercallosidine N-isobutyl-trans-2-trans-4-eicosadienamide and other alkaloids of fruits of Piper guineense Cyclobutanoid Amides from <i>Piper arborescens</i>