N6-((7R,8S)-2-(((4S)-4-ammonio-5-oxido-5-oxopentyl)amino)-8-hydroxy-7-(hydroxymethyl)-6-oxa-1,3-diazaspiro(4.4)non-1-en-4-ylidene)-L-lysinate
n6-((7r,8s)-2-(((4s)-4-ammonio-5-oxido-5-oxopentyl)amino)-8-hydroxy-7-(hydroxymethyl)-6-oxa-1,3-diazaspiro(4.4)non-1-en-4-ylidene)-l-lysinate