A monoclonal antibody elicited against a phosphonate transition state analogue was shown to initiate chemiluminescence from luminogenic spiro[adamantane-2,3A-(1,2-dioxetane)] substrates by selectively cleaving a benzoate ester triggering group. † Experimental details for the preparation and characterisation of hapten 1 and substrates 2 and 3, and the monoclonal antibodies together with kinetic data are provided as electronic supplementary information. See

Key indicatorsSingle-crystal X-ray study T = 150 K Mean '(C±C) = 0.004 A Ê R factor = 0.035 wR factor = 0.082 Data-to-parameter ratio = 14.4For details of how these key indicators were automatically derived from the article, see

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