Molbank, Vol. 2015, Article M875: (8R,10aS)-Methyl 2,4-diamino-8-(tert-butyl)-6-oxo-6,8,10,10a-tetrahydrooxazolo[3′′,4′′:1′,5′]-pyrrolo[3′,4′:5,6]pyrido[2,3-d]pyrimidine-10a-carboxylate

A fused polyheterocyclic derivative is available by annulation of a tetramate scaffold, and has been shown to have some Gram-negative, but not Gram-positive, antibacterial activity.

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