Abstract Pipajiains H–J (1–3), three new phenolic derivatives with an unusual sulfone group,
pipajiamides A–C (4–6), three new amide derivatives, pipajiaine A (7), one new imidazole …

This study was designed to characterize compounds from two thousands of insects of Blaps
japanensis. With this purpose, pipajiains A–C (1–3), three novel phenolic derivatives …

Abstract Blapspirooxindoles A–C (1–3), three novel spirooxindole alkaloids with a unique
spiro [chromane-4, 3′-indoline]-2, 2′-dione motif, blapcumaranons A and B (4 and 5), two …

Three new dibromopyrrole alkaloids, 9-N-methylcylindradine A (1), 1-N-methylugibohlin (2),
nemoechine H (3), together with one known dibromopyrrole alkaloid N …

Pyrinadines B–G, new bis-pyridine alkaloids with an azoxy moiety from sponge Cribrochalina sp. -
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Three new sesquiterpenoid quinones, nakijiquinones G–I (1–3), containing a different amino
group derived from amino acids have been isolated from Okinawan marine sponges of the …

The chemical constituents of the carboxylic acid derivatives from the ear of Schizonepeta
were investigated. 1H and 13C NMR chemical shifts of the carboxylic acid derivatives were …

Four new alkaloids (1− 4) were isolated from the marine sponge Axinella brevistyla, and
their structures were determined on the basis of spectroscopic analysis. The alkaloids 1− 4 …

Abstract Two bispyrroloiminoquinone alkaloids, wakayin (1) and a new natural product 16‐
hydroxy‐17‐oxindole wakayin (2), were isolated from a Thai collection of the ascidian …

Investigation of the tropical sponges Axinella damicornis and Stylissa flabelliformis, family
Axinillidae, afforded five new bromopyrrole alkaloids (1–5) and thirteen known compounds …