The present invention relates to compounds of formula IwhereinR, R1, R2, R3, R4, aryl, n, and m are as defined in the specification and pharmaceutically acceptable acid addition salts and tautomeric forms thereof. The communications module is a microprocessor-based transmitterreceiver which receives data collection requests from a system server, initiates data collection from a utility meter, and reports the data back to a host computer system residing, for example, at a central office. The outer body forms a radial flange and is made of a lighter material than that of the core. In a seamless multiple angle structure, the current angle can be switched without need to increase the number of interleave units.