prov:value
| - or is a substituent selected from the group consisting of: O, S, SO2, CH2, O???C, C(CH3)2, C(CF3)2, Si(CH3)2, Si(CH2 CF2 CF3)2 ; wherein X is a bond or is a substituent selected from the group consisting of: ##STR38## wherein Z is a substituent selected from the group consisting of: ##STR39## wherein R is a substituent selected from the group consisting of: CH3, CH3 CH2, (CH2)2 CH3, CH(CH3)2, C6 H
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