A heterotrimer complex consisting of one molecule of lymphotoxin-alpha and two molecules of the lymphotoxin-beta. It is anchored to the cell surface via the transmembrane domains of the lymphotoxin-beta component and has specificity for the lymphotoxin beta receptor. The lymphotoxin alpha1, beta2 heterotrimer plays a role in regulating lymphoid organogenesis and the differentiation of certain subsets of NATURAL KILLER cells.