1. The molecule's core is a six-membered piperazine ring, numbered so that the two nitrogens are N1 and N4.
   - N4 carries a 2-hydroxyethyl substituent (-CH2-CH2-OH).
   - N1 is bonded via a single methylene group (-CH2-) to a fused bicyclic system described below.

2. The fused bicyclic system consists of an aromatic ring fused to a second ring containing one oxygen and one lactone-type carbonyl. Starting from the -CH2- link attached to N1, you enter the aromatic ring at carbon C1, which is numbered sequentially as C1-C2-C3-C4-C5-C6.
   - At C2, there is a phenolic hydroxyl group (-OH).
   - At C3, a -CH2-CH2-C(=O)-O-CH3 substituent (a 3-(methoxycarbonyl)propyl group) is attached.
   - The aromatic ring is fused to the second ring between C5 and C6. The second ring is numbered as C5-C7-C8-C9-O-C6.
   - C7 carries a methyl group and is double-bonded to C8.
   - C9 is double-bonded to an oxygen forming a carbonyl.
