(E)-6-[3-[(N-cyano-N'-methylcarbamimidoyl)amino]phenyl]-6-pyridin-3-ylhex-5-enoic acid (E)-6-[3-[(N-cyano-N'-methyl-carbamimidoyl)amino]phenyl]-6-(3-pyridyl)hex-5-enoic acid (E)-6-[3-[[(cyanoamino)-methyliminomethyl]amino]phenyl]-6-(3-pyridyl)hex-5-enoic acid (E)-6-[3-[(N-cyano-N'-methyl-carbamimidoyl)amino]phenyl]-6-pyridin-3-yl-hex-5-enoic acid