Source:http://linkedlifedata.com/resource/umls/id/C1156997
GO: The chemical reactions and pathways resulting in the breakdown of lignans, any member of a class of plant metabolites related to lignins. Lignans are usually found as phenylpropanoid dimers in which the phenylpropanoid units are linked tail to tail and thus having a 2,3 dibenzylbutane skeleton, but higher oligomers can also exist. [GOC:jl, PMID:10074466]