http://linked.open...ynthesisReference
| - Lucien E. Bourson, Serge Y. Delavarenne, Pierre Tellier, "1,2,3,4,4a,9a-Hexahydro-9,10-anthracene-dione, its preparation and its application to the delignification of lignocellulosic materials." U.S. Patent US4235666, issued June, 1929. (en)
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