prov:value
| - o form a ring, and R1 through R16 are synonymous with those of Formula 4; (Formula 8) wherein, in Formula 8, M4 represents one trivalent metal atom, n is an integer higher than 1, Z is a divalent group represented by ???O??? or ???O???R???O???, wherein R represents a divalent group derived from compounds comprising elements of IV group (C, Si, Ge, Sn and Pb), and R1 through R18 are synonymous with
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