[(E)-N'-(2-cyanoethynyl)-N-[[8,9-dicyano-3-(2-cyanoethynyl)-2-[(2-cyanoethynylamino)methyl]-14-[(E)-N-(2-cyanoethynyl)-C-methylidyneammonio-carbonimidoyl]-14-[[[3-[[3-[[[2-cyanoethynyl(methylidyneammoniomethyl)amino]-(2-cyanoethynylsulfanyl)methyl]-[[(Z)-1,2-dicyano-2-methylidyneammonio-vinyl]cuprio]sulfonio]-2-isocyanato-propanoyl]amino]prop-2-ynylamino]methylamino]methyl]-2,14-bis(methylidyneammonio)-2-(3-methylidyneammonioprop-1-ynylamino)-1,10-dioxa-3,5,7,13-tetraza-2λ⁶,14λ⁵-dicupracyclotetradec-7-en-2-yl]methyl]carbamimidoyl]-bis(hydroxymethyl)copper; 2-cyanoethynyl(methylidyne)ammonium; formaldehyde