Abstract: The disclosure provides a resin having unsaturated functionality effective for self-cross linking in compositions that are at least substantially free of external cross linkers and still achieve desired performance for internal and/or external food or beverage can coating applications. Unsaturation may be provided by reactants having a carbon-carbon double bond less reactive than a carbon-carbon double bond of maleic anhydride.

Abstract: The disclosure provides a resin having unsaturated functionality effective for self-cross linking in compositions that are at least substantially free of external cross linkers and still achieve desired performance for internal and/or external food or beverage can coating applications. Unsaturation may be provided by reactants having a carbon-carbon double bond less reactive than a carbon-carbon double bond of maleic anhydride.

Abstract: The invention relates to novel derivatives of tetrahydro-2,3,6,7,1H,5H,11H-(1)benzopyrano(6,7,8ij)quinolizinone in accordance with the formula: ##STR1## in which R.sup.1 represents 1) --NH--(CH.sub.2).sub.n --R.sup.2 with n being an integer between 1 and 20 and R.sup.2 representing --N.dbd.C.dbd.S or NH--CO--CH.sub.2 X with X representing I, Br or Cl, or2) --NH--(CH.sub.2 --CH.sub.2 --O)m--CH.sub.2 --CH.sub.2 --R.sup.3 with m being an integer between 1 and 30 and R.sup.3 representing a group chosen from among groups of formula ##STR2## in which p is an integer from 1 to 10 and X represents Br, Cl or I. These derivatives can be use as markers for organic compounds, in particular biological substances, for the detection thereof by chemiluminescence or fluorescence.