isBenzeneLike(vertices) {
    let db = this.getDoubleBondCount(vertices);
    let length = this.members.length;
    return db === 3 && length === 6 || db === 2 && length === 5;
  }
Check whether this ring is an implicitly defined benzene-like (e.g. C1=CC=CC=C1) with 6 members and 3 double bonds.

@param {Vertex[]} vertices An array of vertices associated with the current molecule.
@returns {Boolean} A boolean indicating whether or not this ring is an implicitly defined benzene-like.