A condensed cyclic compound represented by one of Formulae 1A to 1D, wherein the Formulae 1A to 1D are described in the specification. The proxies at the ingress edge device modify the multicast data packet to replace the destination address with the address of a proxy running on an egress edge device, such that the encrypted domain routes the packet directly to the proxy at the egress edge device without processing it as a multicast data packet. The quality indicator is stored by exception only.