| http://www.w3.org/ns/prov#value | - eferably CH2, and R14 and R12 may be bound together to form a ring when f is 0; R15 is carbon or silicon; f is an integer that is equal to 0, 1, or 2; g is an integer that is equal to 0, 1, or 2, provided that if the two R1 groups are linked, then they do not form a butadiene group when M is Zr.
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