fluoroacetaldehyde + L-threonine => 4-fluoro-L-threonine + acetaldehyde
fluoroacetaldehyde + l-threonine => 4-fluoro-l-threonine + acetaldehyde
fluoroacetaldehyde + L-threonine => 4-fluoro-L-threonine + acetaldehyde
fluoroacetaldehyde + l-threonine => 4-fluoro-l-threonine + acetaldehyde