There are provided compounds of the formulawherein R1, R2, R3, X, ring A and ring B are as described. In one particular approach, turbocharger lag is addressed by decreasing gaseous fuel injection while increasing liquid fuel injection to increase cylinder fresh air over and above any changes to fresh air via the throttle, wastegate, andor turbocharger. The images in the database are grouped in clusters according to a similarity criterion so that mutually similar images reside in the same cluster. The ventilation flap is suitable for motor vehicle instrument panels.