(6Z,8Z)-2,4,6-Trimethyl-8-phenyl-7-oxa-2,4-diazabicyclo[4.2.0]octane-3,5-dione

The title compound, C₁₄H₁₆N₂O₃, is a model of the crucial intermediate in a postulated mechanism for the enzyme (6-4) photoproduct photolyase, which repairs a particular form of UV-light induced DNA damage. The dihedral angle of the two oxetane ring H atoms is 143.5°, which means the bulky phenyl ring is exo to the pyrimidine ring.

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