Crystal structure of olivetolic acid: a natural product from (Schaer.).

The title compound, CHO (systematic name: 2,4-dihy-droxy-6-pentyl-benzoic acid) is a natural product isolated from (Schaer.) and is reported to have various pharmacological activities. The mol-ecule is approximately planar (r.

NMR reassignment of stictic acid isolated from a Sumatran lichen Stereocaulon montagneanum (Stereocaulaceae) with superoxide anion scavenging activities.

The phytochemical study of Stereocaulon montagneanum harvested in Sumatra (Indonesia) led to the isolation of 11 known compounds including two metabolites not previously described in the genus Stereocaulon, peristictic acid (8) and menegazziaic acid (10). The complete 1H and 13C NMR spectral assignments of stictic acid derivatives are reported with some revisions. Five depsidones belonging to the stictic acid chemosyndrome were superoxide anion scavengers as potent as ascorbic acid and with no toxicity on two human cell lines.

Enhancement of a Novel Isolate of Serratia plymuthica as Potential Candidate for an Antianthracnose.

Background And Objective: A new rhizobacteria isolate of Serratia plymuthica (strain UBCR_12) exhibited a promising potential as a biocontrol agent for anthracnose causing agent Colletotrichum gloeosporioides. The aim of this study was to characterize its antagonistic activity and explore the factors contributing to a higher inhibition activity.

Materials And Methods: The antifungal effect of UBCR_12 against C.

Lobarin from the Sumatran lichen, Stereocaulon halei.

The diphenyl ether, lobarin (1) (syn. lobariol carboxylic acid) related to lobaric acid was isolated for the first time as a natural product along with five known compounds from Stereocaulon halei, a fruticose lichen collected in Indonesia. The structure of lobarin was elucidated by spectroscopic data analysis and its most stable conformers were determined by molecular mechanic dynamic calculations.

rac-Eudesm-7(11)-en-4-ol.

The isolation and structural determination of rac-eudesm-7(11)-en-4-ol, C15H26O, from the steam distillate of the flowers of Dipterocarpus cornutus Dyer (Dipterocarpaceae) is described. The structure was determined from spectroscopic data and a single-crystal X-ray study. Two similar independent molecules comprise the asymmetric unit of the structure.