code: def parse_compound(s, global_compartment=None):
      
      m = re.match(r'^\|(.*)\|$', s)
      if m:
          s = m.group(1)
  
      m = re.match(r'^(.+)\[(\S+)\]$', s)
      if m:
          compound_id = m.group(1)
          compartment = m.group(2)
      else:
          compound_id = s
          compartment = global_compartment
  
      return Compound(compound_id, compartment=compartment)
docs: Parse a compound specification.
  
      If no compartment is specified in the string, the global compartment
      will be used.