label: methyl-(4R)-4-hydroxy-4-((5S,8S)-8-methyl-1,2-dioxo-2-phenyl-2,3,5,8-tetrahydro-1H-(1,2,4)triazolo(1,2a)pyridazin-5-yl)-2-butynoate
label_lc: methyl-(4r)-4-hydroxy-4-((5s,8s)-8-methyl-1,2-dioxo-2-phenyl-2,3,5,8-tetrahydro-1h-(1,2,4)triazolo(1,2a)pyridazin-5-yl)-2-butynoate