Torrent Pharmaceuticals is making an open offer to acquire up to 4,17,45,264 shares of JB Chemicals & Pharmaceuticals at INR 1,639.18 each, for a total of INR 6,842.80 crores, following an agreement to purchase 7,44,81,519 shares from the promoter at INR 1,600 each, resulting in the acquirer gaining control over the company.