Number the benzene ring so that the nitrogen substituent is at C1. That substituent is an N,N-dimethylamino group (a nitrogen bonded to two methyl groups). At the para position (C4), a 1,2-disubstituted vinyl (-CH=CH-) group connects C4 to a carbonyl carbon (C=O). The carbonyl carbon is directly bonded to the oxygen of a tert-butanol group. Tert-butanol consists of a central carbon bonded to three methyl groups and an oxygen. No other ring substituents are present.