bisadduct

Noun

 * 1)  The product of two simultaneous addition reactions on the same molecule
 * Aldrichimica Acta Volume 30 No 4 (pdf) from Sigma-Aldrich
 * Both π-bonds in 42 react with DMAD in the presence of a Ru-catalyst to produce bisadduct 43; this is the first example of a cyclobutene π-bond reacting in this fashion.