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A cyclotriphosphazene contains an alternating six-membered ${\mathrm{P}}_3{\mathrm{N}}_3$ ring. Substitution at its phosphorus atoms can generate geminal, non-geminal and spiro derivatives.

Serap Beşli coauthored research on cyclotriphosphazene.^[ref]

A cyclotriphosphazene contains an alternating six-membered ${\mathrm{P}}_3{\mathrm{N}}_3$ ring. Substitution at its phosphorus atoms can generate geminal, non-geminal and spiro derivatives.