(4S,5R)-4,5,6-trihydroxy-2-iminohexanoate => (2Z,4S,5R)-2-amino-4,5,6-trihydroxyhex-2-enoate
(4s,5r)-4,5,6-trihydroxy-2-iminohexanoate => (2z,4s,5r)-2-amino-4,5,6-trihydroxyhex-2-enoate
(4S,5R)-4,5,6-trihydroxy-2-iminohexanoate => (2Z,4S,5R)-2-amino-4,5,6-trihydroxyhex-2-enoate
(4s,5r)-4,5,6-trihydroxy-2-iminohexanoate => (2z,4s,5r)-2-amino-4,5,6-trihydroxyhex-2-enoate