The Sensex slipped into the negative zone and is now down 18 points at 11,430.Dr.Reddy's has gained 2% at Rs 1,479.HDFC, Tata Motors and HLL are up 1% each at Rs 1,301, Rs 825 and Rs 233, respectively.Hindalco and Tata Steel have dropped 1.7% each to Rs 166 and Rs 524, respectively.Grasim and Reliance Energy are down nearly 1% each at Rs 2,190 and Rs 475, respectively.