1. The main ring (Ring A) is an aromatic six-membered 1,3-diazine, containing two nitrogens at positions 1 and 3 and four carbons at positions 2, 4, 5, and 6.
2. At ring position 4 (a carbon), there is a hydrazino (-NH-NH2) substituent.
3. At ring position 5 (a carbon), there is an ethyl (-CH2CH3) group.
4. At ring position 6 (a carbon), there is an -NH- linker connecting to a second ring (Ring B).
5. Ring B is a five-membered saturated ring with four carbons and one oxygen (a tetrahydrofuran-type ring). The -NH- linker attaches to carbon 3 of Ring B, while oxygen is at position 1. The same carbon (carbon 3) also carries a methyl (-CH3) substituent.

No stereochemical details are specified.