| Compound with a doubly linked carbon atom | 41 |
| Certain chemical compound | 25 |
| Certain alkene | 14 |
| Tautomeric compound | 19 |
| Organic compound containing a hydroxyl group | 44 |
| Organic chemistry topic | 23 |
| Form of ether | 13 |
| Form of acetylacetone | 21 |
| Double-bound compound | 21 |
| Double-bonded compound | 22 |
| Compound with two carbon atoms | 30 |
| Compound with a hydroxyl group | 30 |
| Certain compound | 16 |
| Carbon-bonded compound | 22 |
| ___ ether | 9 |
| Vitamin C compound | 18 |
| Unstable compound | 17 |
| Tautomeric form of vitamin C, e.g. | 34 |
| Puzzler's compound | 22 |
| Picos de Europa lake | 20 |
| Organic compound of crosswords | 30 |
| Organic compound of crossword fame | 34 |
| Often unstable compound | 23 |
| Keto-___ tautomerism (organic chemistry topic) | 46 |
| Hydroxyl-containing compound | 28 |
| Hydroxyl compund | 16 |
| Hydroxl group compound | 22 |
| Form of pyruvic acid | 20 |
| Double-bonded form of acetylacetone | 35 |
| Compound with double-bonded carbon atoms | 40 |
| Compound with a doubly-linked carbon atom | 41 |
| Compound with a double-bonded carbon atom | 41 |
| Compound with a double bond | 27 |
| Compound that's subject to tautomerism | 42 |
| Compound containing a hydroxyl group | 36 |
| Compound containing a hydroxl group | 35 |
| Chemist's double bond compound | 34 |
| Chemical compound form | 22 |
| Carbon component | 16 |
| Ascorbic acid, for one | 22 |
| Acetylacetone form | 18 |
| A compound | 10 |
| ___ Gay (W.W. II plane) | 23 |
| Name on a famous B-29 | 21 |
| __ Gay | 6 |
| Name on a famous WWII bomber | 28 |
| ___ Gay (WWII plane) | 20 |
| Gay leader? | 11 |
| Part of a famous plane name | 27 |
| Gay over Hiroshima | 18 |
| Col. Tibbets's mother | 25 |
| ___ Gay (WWII bomber) | 21 |
| _____ Gay | 9 |
| ___ Gay, famed plane | 20 |
| __ Gay: WWII plane | 18 |
| Name on a WWII bomber | 21 |
| Name on a bomber | 16 |
| ____ Gay | 8 |
| ___ Gay, W.W. II plane | 22 |
| ___ Gay, W.W. II bomber | 23 |
| ___ Gay (W.W. II bomber) | 24 |
| Bomber ___ Gay | 14 |
| "Waterworld" girl | 27 |
| Name on a famous war plane | 26 |
| Name on a 1945 bomber | 21 |
| First name of a famous plane | 28 |
| First name in bombers | 21 |
| First name in B-29 lore | 23 |
| Cajun cookbook author Prudhomme | 31 |
| B-29 bomber name | 16 |
| --- Gay | 7 |
| ___ Gay, historic plane | 23 |
| ___ Gay, famous plane | 21 |
| ___ Gay (W. W. II plane) | 24 |
| Waterworld girl | 18 |
| Warplane name | 13 |
| W.W. II plane ___ Gay | 21 |
| W.W. II bomber ___ Gay | 22 |
| Town outside Harrisburg | 23 |
| Part of a B-29 bomber name | 26 |
| Name on an historic B-29 | 24 |
| Name on a plane | 15 |
| Name on a historic B-29 | 23 |
| Name in B-29 lore | 17 |
| Half a historic bomber | 22 |
| First name on a WWII bomber | 27 |
| First name on a 1945 bomber | 27 |
| Bomber Gay | 10 |
| ''__ Gay'' (WWII plane) | 39 |
| ''__ Gay'' (WWII bomber) | 40 |
| -- Gay (historic bomber) | 24 |
| ___ Gay, famed bomber | 21 |
| ___ Gay (famous warplane) | 25 |
| __ Gay: WWII bomber | 19 |
| WWII's ___ Gay | 18 |
| WWII plane --- Gay | 18 |
| WWII plane ___ Gay | 18 |
| WWII plane __ Gay | 17 |
| WWII pilot Paul Tibbets's mother | 36 |
| WWII bomber's first name | 28 |