2-{[(tert-butoxy)carbonyl][(1-{[(9H-fluoren-9-yl)me thoxy]carbonyl}piperidin-2-yl)methyl]amino}aceti c acid
2-{[(tert-butoxy)carbonyl][(1-{[(9H-fluoren-9-yl)me thoxy]carbonyl}piperidin-2-yl)methyl]amino}aceti c acid(2-{[(tert-butoxy)carbonyl][(1-{[(9H-fluoren-9-yl)me thoxy]carbonyl}piperidin-2-yl)methyl]amino}aceti c acid)