(3R,4R,5R,13aR)-4,5,8,12,13,13a-Hexahydro-4,5-dihydroxy-3,4,5-trimethyl-2H-(1,6)dioxacycloundecino(2,3,4-gh)pyrrolizine-2,6(3H)-dione

Highly reactive chemicals that introduce alkyl radicals into biologically active molecules and thereby prevent their proper functioning. Many are used as antineoplastic agents, but most are very toxic, with carcinogenic, mutagenic, teratogenic, and immunosuppressant actions. They have also been used as components in poison gases.

Reagents with two reactive groups, usually at opposite ends of the molecule, that are capable of reacting with and thereby forming bridges between side chains of amino acids in proteins; the locations of naturally reactive areas within proteins can thereby be identified; may also be used for other macromolecules, like glycoproteins, nucleic acids, or other.