Start with a benzene ring.  
1. Choose the carbon that bears a methoxymethyl group as C-1. Specifically, the ring carbon is bonded to a methylene (-CH2-), which is attached to an oxygen atom that in turn is bonded to a methyl group.
2. At C-3 (meta to C-1), the ring carbon carries a methyl group.
3. At C-6 (para to C-3), the ring carbon carries a methyl 2-propenoate substituent. The ring carbon is directly bonded to the first vinylic carbon, which is double-bonded to the second vinylic carbon. This second vinyl carbon is further bonded to a carbonyl carbon (-C(=O)-), and that carbonyl carbon is esterified with a methoxy group (-OCH3), giving a methyl ester. The geometry of the double bond is unspecified (no E/Z defined).