English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Chemical investigation of the chloroform extract of heartwood of  Tectona grandis  L. f. led to the isolation of three new naphthoquinone derivatives, tectonaquinones A ( 1 ), B ( 2 ) and C ( 3 ), along with six known compounds: barleriaquinone-I ( 4 ), tectoquinone ( 5 ), tecomaquinone I ( 6 ), lapachol ( 7 ), obtusifolin ( 8 ) and 2-hydroxy-3-methyl anthraquinone ( 9 ). The structures of the new compounds were elucidated by spectroscopic methods including 2 D NMR experiments. Tectonaquinone B is the first natural compound that has a hexa-cyclic dinaphthofuran-dione scaffold. Tectonaquinone C has a bicyclic acetal motif that is unusual in nature.

Tectonaquinones A, B and C: three new naphthoquinone derivatives from the heartwood of Tectona grandis