isRingAromatic(ring) {
    for (var i = 0; i < ring.members.length; i++) {
      let vertex = this.graph.vertices[ring.members[i]];

      if (!vertex.value.isPartOfAromaticRing) {
        return false;
      }
    }

    return true;
  }
Check whether or not a ring is an implicitly defined aromatic ring (lower case smiles).

@param {Ring} ring A ring.
@returns {Boolean} A boolean indicating whether or not a ring is implicitly defined as aromatic.