At any time and from time to time after the date hereof, any Seller shall, upon the request of Purchaser, and Purchaser shall, upon the request of any Seller, promptly execute, acknowledge and deliver such further instruments and other documents, and perform or cause to be performed such further acts, as may be reasonably required to evidence or effectuate the sale, conveyance, transfer and delivery hereunder of the Purchased Stock and the Purchaser Common Stock and the performance by the parties of any of their other respective obligations under this Agreement and to carry out the purposes and intent of this Agreement.