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checkbox validation rule

Hello, if someone can help me figure this out, it would be great. 

I have a checkbox that when checked, the Lead Status picklist when selected with a particular item, a multi-picklist field can't be left blank, as the user will need to make a selection. If the multipicklist is left blank and a user tries to save the lead, user will be prompted to fill in the multipicklist field. 

API Names:
checkbox12__c (checkbox)
Lead Status = Pure (picklist)
Special_Items__c must not be blank when above two match criteria

Cyrus TalladenCyrus Talladen
If you put values for the picklist fields without nulls, such that the user has to select an option, then I think you can make your life easier in that situation.

Cyrus T
Could you please provide the syntax for this? Thanks!
There are other choices in the picklist field, but I only want this rule to work when "Pure" is selected from the other items within the Lead Status picklist.