No, command is incorrect.
You can play with mask to define multiple MAC in single statement or you have to configure multiple statements like following:-
access-list 700 deny 18f6.430e.2b7b 0000.0000.0000
access-list 700 deny 2082.c0d5.7eeb 0000.0000.0000
access-list 700 deny 4082.c0d5.76ab 0000.0000.0000
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i never seen a command which is using only one like to add multiple mac address...better to use with multiple statement.
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You can do by playing with mask but for that MAC address are in some symmetry. Otherwise you have to add single statement for each.
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