Abstract: This invention provides novel lipoglycosides having the structural formula: ##STR1## wherein R.sub.1 and R.sub.2 are different and are selected from the group consisting of hydrogen and ##STR2## The lipoglycosides have antitumor properties.

Abstract: This invention provides an extract from the plant Cerastium viscusum L. (Coryophyllaceae) Mississippi and a method of obtaining same. The extract is obtained by subjecting the plant to a series of extraction steps with a plurality of solvents having different polarities. In each extraction step, the solvent used has a polarity higher than that used in the preceding extraction step. All extraction steps are conducted at room temperature. The extracts have been found to possess biological activity.

Abstract: This invention provides an extract from the plant Myrcia fallax (Myrtaceae) Peru and a method of obtaining same. The extract is obtained by subjecting the plant to a series of extraction steps with a plurality of solvents having different polarities. In each extraction step, the solvent used has a polarity higher than that used in the preceding extraction step. All extraction steps are conducted at room temperature. The extracts have been found to possess biological activity.

Abstract: This invention provides an extract from the plant Maytenus nemerosa (Eckl & Zeyh) Morais (Celastroceae) South Africa and a method of obtaining same. The extract is obtained by subjecting the plant to a series of extraction steps with a plurality of solvents having different polarities. In each extraction step, the solvent used has a polarity higher than that used in the preceding extraction step. All extraction steps are conducted at room temperature. The extracts have been found to possess biological activity.

Abstract: This invention provides an extract from the plant Myristica castaneifolia (Myristacaceae) Fiji and a method of obtaining same. The extract is obtained by subjecting the plant to a series of extraction steps with a plurality of solvents having different polarities. In each extraction step, the solvent used has a polarity higher than that used in the preceding extraction step. All extraction steps are conducted at room temperature. The extracts have been found to possess biological activity.

Abstract: An improved synthesis is disclosed for 7-alkylamino-3-methylpyrazolo[4,3-d]pyrimidines, which are known to be potent cytokinin antagonists.

Abstract: A series of compounds having anticytokinin activity comprising 7-amino-substituted-2-alkylthio or alkoxypyrrolo [2,3-d] pyrimidine derivatives in which the alkyl group has from 1 to 10 and preferably 4 to 7 carbon atoms and which may be substituted with halogen or hydroxyl groups.

Abstract: Alkylation processes wherein diazoalkane alkylation reagents are generated in situ and utilized to alkylate substrates are disclosed. These processes utilize the relatively slow base-catalyzed decomposition of an N-alkyl, N-nitrosourea to produce a corresponding diazoalkane alkylation reagent, followed by the much faster reaction between the alkylation reagent and the substrate to be alkylated. Generically, suitable ureas can be represented by the structural formula, ##EQU1## wherein R represents the alkyl moiety to be added to the substrate; R can be alkyl, cycloalkyl, heteroalkyl, aralkyl or heterocyclic.This process is useful in producing alkylated products without the concomitant disadvantage of building up significant amounts of diazoalkane alkylation reagents during the course of the reaction, many of which have deleterious properties.