This invention provides compounds of formula 1, having the structurewhich are useful as inhibitors of protein tyrosine kinase and are antiproliferative agents. The apparatus includes a data plane unit functioning as an interface that transmits and receives data with a node in the network. The shield portion has a width varying in the first direction, and the semiconductor layer has a thickness varying in the first direction. The second section has a first end, a second end and walls defining a bulbous section.