Importance

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Abstract

Novel derivatives of LSD having the formula ##STR1## wherein R.sub.1 is an alkyl, cycloalkyl or aryl group having 1 to 10 carbon atoms, preferably an alkyl group having 1 carbon atom; R.sub.2 is a bond or ##STR2## wherein R.sub.3 is alkyl, cycloalkyl or aryl group having 2 to 10 carbon atoms, preferably an alkyl group having 2 or 5 carbon atoms; Z is an immunogenic carrier substance, an enzyme donor polypeptide or a label selected from the group consisting of an enzyme, a substance having fluorescent or luminescent properties and a radioactive substance; and n is 1 to p where p equals MW of Z/1000. The derivatives include maleimide conjugates of an immunogenic poly(amino acid), an enzyme donor polypeptide or a labeling substance such as an enzyme, a fluorescent substance or a radioactive substance. Novel activated hapten intermediates useful in the preparation of the conjugates and methods for synthesis of the hapten intermediates and their conjugate derivatives are also disclosed.

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First Claim