Patent ID: 8779137

Claim:
A compound comprising a residue obtained by removing at least one hydrogen atom from a structure represented by the following formula (1): wherein each R 1 represents a hydrogen atom, an alkyl group, an aryl group, an arylalkyl group, an acyl group, or a monovalent heterocyclic group, each of these groups optionally having a substituent; the R 1 s may be the same or different; each R 2 represents a hydrogen atom, an alkyl group, an alkoxy group, an aryl group, an aryloxy group, an arylalkyl group, an arylalkoxy group, an alkenyl group, an arylalkenyl group, an acyl group, an acyloxy group, a monovalent heterocyclic group, or a heterocyclyloxy group, each of these groups optionally having a substituent; the R 2 s may be the same or different; two R 2 s bonded to the same carbon atom may be connected to form a ring; each R 4 represents a hydrogen atom, an alkyl group, an aryl group, an arylalkyl group, or a monovalent heterocyclic group, each of these groups optionally having a substituent; the R 4 s may be the same or different; the two R 4 s may be connected to form a ring; each R 15 represents an alkyl group, an alkoxy group, an aryl group, an aryloxy group, an arylalkyl group, an arylalkoxy group, an alkenyl group, an arylalkenyl group, an alkynyl group, an arylalkynyl group, an amino group, a silyl group, a halogen atom, an acyl group, an acyloxy group, a carbamoyl group, a monovalent heterocyclic group, a heterocyclyloxy group, a carboxyl group, a nitro group, or a cyano group, each of these groups optionally having a substituent; where there are a plurality of R 15 , they may be the same or different; each e represents an integer of from 0 to 6; and the plurality of e's may be the same or different.