4-(2-(((R)-4-carboxy-2-((R,Z)-6,9-dioxo-5-(5-(phosphonoamino)-1,2,4-thiadiazol-3-yl)-3,10-dioxa-4,7-diazadodec-4-en-8-yl)-3,6-dihydro-2H-1,3-thiazin-5-yl)thio)thiazol-4-yl)-1-methylpyridin-1-ium