Get multi select list field options

//Get the issue
def issue = Issues.getByKey('<IssueKeyHere>')

//Get the custom field value for the issue by the custom field name i.e. "Teams To Notify Of This Change"
//We know that it is a multi select field and we cast the result to a Map so we can extract the value of each option
def values = issue.getCustomFieldValue('<CustomFieldNameHere>') as Map

values*.value