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