added_tokens.json

{
  "<design_body>": 32770,
  "<design_end>": 32769,
  "<design_start>": 32768,
  "<molecule>": 32771,
  "<retro_body>": 32774,
  "<retro_end>": 32773,
  "<retro_start>": 32772,
  "<rollback_end>": 32776,
  "<rollback_start>": 32775
}