| Answer | Crossword Clue |
|---|---|
| OPERA | One of four in Wagner's Ring cycle |
| OPERA | One of four in Wagner's Ring Cycle |
| ERDA | Goddess in Wagner's Ring cycle |
| OBOISTS | Threesome needed in Wagner's "Ring" cycle |
| thiazines | Any of a class of molecules containing a ring of one nitrogen, one sulfur, and four carbon atoms, used in dyes and more recently in sedatives |
| pyrrolic | a toxic liquid heterocyclic compound C4H5N that has a ring consisting of four carbon atoms and one nitrogen atom, polymerizes readily in air, and is the parent compound of many biologically important substances (as bile pigments, porphyrins, and chlorophyll) |
