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ACD/Labs Blog

Mikhail Elyashberg
Ni et al investigated Cephalotaxus mannii Hook f. which led to the isolation of three new diterpenoids, namely, mannolides A−C, and two new Cephalotaxus troponoids. We used the example of Mannolide A (molecular formula C20H24O5) to challenge our ACD/Structure Elucidator Suite software.

Mikhail Elyashberg
From investigating the constituents of Sarcandra glabra, P. Wang et al isolated a pair of structurally-related terpene lactones, sarglaperoxides A and B. The original experimental data related to Sarglaperoxide A (molecular formula C23H28O5) were used to challenge ACD/Structure Elucidator Suite and determine if the software could reliably elucidate this novel structure.

Mikhail Elyashberg
Bautista et al reinvestigated the chemical composition of S. amarissima. As a result, Teotihuacanin (molecular formula C20H20O6), an unusual rearranged clerodane diterpene with a new carbon skeleton containing a spiro-10/6 bicyclic system, was isolated from the leaves and flowers of Salvia amarissima.

Mikhail Elyashberg
Ruthmycin (molecular formula C21H22O7) possesses an unprecedented signature C3 bridge and a corresponding fused six-member ring. In the context of known frenolicin-type scaffolds, the presence of a C-3/C-4 double bond is also unprecedented.

ACDLabs
The elucidation of unknown structures, especially those with novel moieties found in natural products, often results in initially incorrect published structures, which then require either exhaustive spectroscopic analysis, full chemical synthesis or both to prove the correct structure. In many cases, the initial incorrect structure and subsequent analytical work could be avoided using computer-assisted structure...

Mikhail Elyashberg
Callyspongiolide Macrolides have been reported from various marine macroorganisms, but are especially prominent for marine sponges. Many macrolides display potent anti-proliferative properties against cancer cells, making them promising leads for the development of new chemo-therapeutic agents. Due to their unusual structures and pronounced bioactivity, these compounds continue to be exciting targets for realizing a total...

Mikhail Elyashberg
Tronoharine was isolated in a small amount as a minor alkaloid from a sample of T. corymbosa and given a proposed structure. In a more recent work, it was obtained in a more significant amount, which enabled the authors to reevaluate the previously proposed structure. Structure Elucidator Suite was used to confirm the newly proposed structure of Tronoharine ((molecular formula C21H24N2O2).

Mikhail Elyashberg
Zhao et al isolated two novel rearranged triterpenoids from the leaves and twigs of A. chensiensis.—Spirochensilides A and B. The spectroscopic data used to elucidate the structure of Spirochensilide A (molecular formula C30H42O5), a compound containing unprecedented spiro-[5,6]system, were used to challenge ACD/Structure Elucidator Suite.

ACDLabs
In collaboration with Sequoia Sciences Inc., we developed a strategy for the dereplication of a complete or a partial structure using 1H NMR, 1H–13C HSQC and 1H–1H COSY spectral data, a molecular formula composition range and structural fragments against a massive database of about 22 million compounds is considered. The work was based on 18...

ACDLabs
Most existing antibiotics were discovered through screens of environmental microbes, particularly the streptomycetes, for the capacity to prevent the growth of pathogenic bacteria. This “activity-guided screening” method has been largely abandoned because it repeatedly rediscovers those compounds that are highly expressed during laboratory culture. Most of these metabolites have already been biochemically characterized. However, the...