code: private String readCommand(String line) throws CDKException {
          if (line.startsWith("M  V30 ")) {
              String command = line.substring(7);
              if (command.endsWith("-")) {
                  command = command.substring(0, command.length() - 1);
                  command += readCommand(readLine());
              }
              return command;
          } else {
              throw new CDKException("Could not read MDL file: unexpected line: " + line);
          }
      }
docs: Reads the command on this line. If the line is continued on the next, that
  part is added.
  
  @return Returns the command on this line.