(11bR)-1-(2-(3H-Dinaphtho[2,1-c:1′,2′-e]azepin-4(5H)-yl)-1,2-diphenylethyl)-3-(3,5-bis(trifluoromethyl)phenyl)thiourea is a chiral thiourea catalyst that has emerged as an efficient class of organocatalysts due to their unique dual hydrogen-bonding capacity.