Chemical Composition, Larvicidal and Molluscicidal Activity of Essential Oils of Six Guava Cultivars Grown in Vietnam.

Diseases transmitted by mosquitoes and snails cause a large burden of disease in less developed countries, especially those with low-income levels. An approach to control vectors and intermediate hosts based on readily available essential oils, which are friendly to the environment and human health, may be an effective solution for disease control. Guava is a fruit tree grown on a large scale in many countries in the tropics, an area heavily affected by tropical diseases transmitted by mosquitoes and snails.

A new resorcinol derivative from the bark of (Primulaceae).

Chemical investigation of the Vietnamese plant Roem. & Schult. (Primulaceae) led to the isolation of the new compound 3-methoxy-5-nonylphenol () along with five known ones 2,8,10-trihydroxy-6-benzo[]chromen-6-one (), 2-hydroxy-5-methoxy-3-nonylbenzo-1,4-quinone (), 5-(3-hydroxypropyl)-7-methoxy-3-(methylbenzofuran-2-yl)-3-methoxyphenol (), 2,8-dihydroxy-7-methoxy-3,9-diundecyldibenzofuran-1,4-dione () and 10-hydroxy-4-methoxy-2,11-diundecylgomphilactone ().