| http://www.w3.org/ns/prov#value | - f the formula MAlR4, wherein R and M are the same as defined above; compounds of the formula R'3-m AlXm wherein R' is a hydrogen atom, or an alkyl or aryl group, X is the same as defined above, and m is zero or a positive number of not greater than 3; compounds of the formula R'3-n Al(OR)n wherein R' is the same as defined above, and n is a positive number greater than 0 but not greater than 3; an
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