Are there alternatives to N~2~-[(9H-Fluoren-9-ylmethoxy)carbonyl]-N~2~-methyl-N~6~-{[(2-methyl-2-propanyl)oxy]carbonyl}-L-lysine (CAS: 197632-76-1) in synthesis?

Several alternatives can be considered for the synthesis of N~2~-[(9H-Fluoren-9-ylmethoxy)carbonyl]-N~2~-methyl-N~6~-{[(2-methyl-2-propanyl)oxy]carbonyl}-L-lysine (CAS: 197632-76-1), including analogs like related amino acids or similar fluorenecarbonyl derivatives, and isomers. Common alternative reagents include protected amino acids and fluorene derivatives, though the choice depends on the specific synthesis context and desired product properties.