src/main/java/org/helm/notation2/parser/notation/polymer/PolymerSingleElements.java
@Override
  public void addMonomerNotation(String str) throws SimplePolymerSectionException, NotationException {
    if (this.listMonomerNotations.size() < 1) {
      this.listMonomerNotations.add(ValidationMethod.decideWhichMonomerNotation(str, entity.getType()));
    } else {
      throw new SimplePolymerSectionException("Only one Monomer unit is allowed for CHEM and BLOB");
    }

  }
@Override
  public void addMonomerNotation(String str) throws SimplePolymerSectionException, NotationException {
    if (this.listMonomerNotations.size() < 1) {
      this.listMonomerNotations.add(ValidationMethod.decideWhichMonomerNotation(str, entity.getType()));
    } else {
      throw new SimplePolymerSectionException("Only one Monomer unit is allowed for CHEM and BLOB");
    }

  }
{@inheritDoc}

@throws SimplePolymerSectionException if simple polymer section is not valid
@throws NotationException if not notation is not valid