[4. 5]癸-1-酮; (R) -8- ((R) -2-羥基-2- (4-甲基-1-氧代-1,3-二氫異苯并呋喃-5-基)乙基)-3-甲 基-2- (5-氧代-2, 5-二氫呋喃-3-基)-2, 8-二氮雜螺[4. 5]癸-1-酮; (S) -8- ((R) -2-羥基-2- (4-甲基-1-氧代-1,3-二氫異苯并呋喃-5-基)乙基)-3-甲 基-2- (5-氧代-2, 5-二氫呋喃-3-基)-2, 8-二氮雜螺[4. 5]癸-1-酮; 8-[(2R)-2-羥基-2-(4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙 基]-2-(4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-2, 8-二氮雜螺[4. 5]癸-1-酮; 8- [(2S)-2-羥基-2-(4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙 基]-2-(4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-2, 8-二氮雜螺[4. 5]癸-1-酮; 9- [(2R)-2-羥基-2-(4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙 基]-2- (4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-1-氧代-2-氮雜-9-氮雜螺[5. 5] i^一 燒; 5- {(IR) -1-羥基-2- [2- (5-氧代-2, 5-二氫呋喃-3-基)-2, 8-二氮雜螺[4. 5] 癸-8-基]乙基} -4-甲基-2-苯并呋喃-I (3H)-酮; 8-[(2R)-2-羥基-2-(4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙 基]-2-(2-甲基-5-氧代-2, 5-二氫呋喃-3-基)-2, 8-二氮雜螺[4. 5]癸-1-酮; 2- (2, 4-二甲基-5-氧代-2, 5-二氫呋喃-3-基)-8- [ (2R) -2-羥基-2- (4-甲基-1-氧 代-1,3-二氫-2-苯并呋喃-5-基)乙基]-2, 8-二氮雜螺[4. 5]癸-1-酮; 8-[(2R)-2-羥基-2-(4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙 基]-2- (5-氧代-2, 5-二氫呋喃-3-基)-2, 8-二氮雜螺[4. 5]癸-3-酮; 8-[(2R)-2-羥基-2-(4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙 基]-2-(4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-2, 8-二氮雜螺[4. 5]癸-3-酮; 2- (4-乙基-5-氧代-2, 5-二氫呋喃-3-基)-8- [ (2R) -2-羥基-2- (4-甲基-1-氧 代-1,3-二氫-2-苯并呋喃-5-基)乙基]-2, 8-二氮雜螺[4. 5]癸-1-酮; (IR, 3r,5S) -8- [ (2R) -2-羥基-2- (4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基) 乙基]_1' _ (5-氧代-2, 5-二氫呋喃_3_基)-2' H-螺[8-氮雜雙環(huán)[3. 2. 1]半燒-3, 3' -批 咯烷]-2'-酮; (IR, 3r,5S) -8- [ (2R) -2-羥基-2- (4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基) 乙基]-Γ-(4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-2'H-螺[8-氮雜雙環(huán)[3. 2. 1]辛 烷-3, 3'-吡咯烷]-2'-酮; (IR, 3s,5S) -8- ((R) -2-羥基-2- (4-甲基-1-氧代-1,3-二氫異苯并呋喃-5-基)乙 基)-Γ - (4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-8-氮雜螺[二環(huán)[3. 2. 1]辛烷-3, 3' -吡 咯烷]-2'-酮; 8-[(2S)-2-羥基-2-(4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙 基]-2- (5-氧代-2, 5-二氫呋喃-3-基)-2, 8-二氮雜螺[4. 5]癸-1-酮; 2_ (4-氟-5-氧代-2, 5-二氫呋喃-3-基)-8- [ (2R) -2-羥基-2- (4-甲基-1-氧 代-1,3-二氫_2_苯并呋喃_5_基)乙基]-1-氧代_2_氮雜_8_氮雜螺[4. 5]癸燒; 9- [ (2R) -2-羥基-2- (4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙基]-1-氧 代_2_ (5-氧代-2, 5-二氫呋喃_3_基)_2_氮雜_9_氮雜螺[5. 5]十一燒; 9-[(2R)-2-羥基-2-(4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙 基]-2_ (5-氧代-2, 5-二氫呋喃_3_基)_2_氮雜_9_氮雜螺[5. 5]十一燒; 2- (4-氯-5-氧代-2, 5-二氫呋喃-3-基)-8- [ (2R) -2-羥基-2- (4-甲基-1-氧 代-1,3-二氫_2_苯并呋喃_5_基)乙基]-1-氧代_2_氮雜_8_氮雜螺[4. 5]癸燒; 6-羥基-8- [ (2R) -2-羥基-2- (4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙 基]-2-(4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-1-氧代-2-氮雜-8-氮雜螺[4. 5]癸 燒; 6_氟-8- ((R) -2-羥基-2- (4-甲基-1-氧代-1,3-二氫異苯并呋喃-5-基)乙 基)-2-(4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-2, 8-二氮雜螺[4. 5]癸-1-酮; 8-[(2R)-2-羥基-2-(4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙基]-3-甲 基-2-(4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-2, 8-二氮雜螺[4. 5]癸-1-酮; 2- (4-環(huán)丙基-5-氧代-2, 5-二氫呋喃-3-基)-8- [ (2R) -2-羥基-2- (4-甲基-1-氧 代-1,3-二氫-2-苯并呋喃-5-基)乙基]-2, 8-二氮雜螺[4. 5]癸-1-酮; 4-羥基-8- [ (2R) -2-羥基-2- (4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙 基]-2-(4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-1-氧代-2-氮雜-8-氮雜螺[4. 5]癸 燒; 8-((R)-2-羥基-2-(4-甲基-1-氧代-1,3-二氫異苯并呋喃-5-基)乙基)-4-甲氧 基-2-(4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-2, 8-二氮雜螺[4. 5]癸-1-酮; 8-[(2R)-2-羥基-2-(4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙 基]-2- (4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-1,4-二氧代-2-氮雜-8-氮雜螺[4. 5] 癸燒; 8-[(2S)-2-羥基-2-(6-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙 基]-2-(4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-1-氧代-2-氮雜-8-氮雜螺[4. 5]癸 燒; 8-[(2R)-2-羥基-2-(6-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙 基]-2-(4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-1-氧代-2-氮雜-8-氮雜螺[4. 5]癸 燒; (IR, 3r,5S) -8- [ (2R) -2-羥基-2- (4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基) 乙基]-5'-甲基-Γ-(5-氧代-2, 5-二氫呋喃-3-基)-2'H-螺[8-氮雜雙環(huán)[3. 2. 1]辛 烷-3, 3'-吡咯烷]-2'-酮; (IR, 3r,5S) -8- [ (2S) -2-羥基-2- (4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基) 乙基]-5'-甲基-Γ-(5-氧代-2, 5-二氫呋喃-3-基)-2'H-螺[8-氮雜雙環(huán)[3. 2. 1]辛 烷-3, 3'-吡咯烷]-2'-酮; 8-[(2R)-2-羥基-2-(4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙 基]-2- (4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-1-氧代-2-氮雜-8-氮雜螺[4. 5] 癸-3-烯; (R) -8- (2-羥基-2- (4-甲基-1-氧代-1,3-二氫異苯并呋喃-5-基)乙基)-2- (5-氧 代-2, 5-二氫呋喃-3-基)-2, 8-二氮雜螺[4. 5]癸-3-烯-1-酮; (IR, 3's,5S) -9- [ (2R) -2-羥基-2- (4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基) 乙基]-7-甲基-1'- (4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-2'H-螺[7, 9-二氮雜雙環(huán) [3. 3. 1]壬烷-3, 3' -吡咯烷]-2' -酮; (IR, 3's,5S) -9- [ (2S) -2-羥基-2- (4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基) 乙基]-7-甲基-1'- (4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-2'H-螺[7, 9-二氮雜雙環(huán) [3. 3. 1]壬烷-3, 3' -吡咯烷]-2' -酮; 8- [ (2R) -2-氟-2- (4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙基]-2- (4-甲 基-5-氧代_2, 5-二氫呋喃-3-基)-2, 8-二氮雜螺[4. 5]癸-1-酮; 8- [ (2S) -2-氟-2- (4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙基]-2- (4-甲 基-5-氧代_2, 5-二氫呋喃-3-基)-2, 8-二氮雜螺[4. 5]癸-1-酮 8-[(2R)-2-甲氧基-2-(4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙 基]-2-(4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-1-氧代-2-氮雜-8-氮雜螺[4. 5]癸 燒; 8-[(2R)-2-乙氧基-2-(4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙 基]-2-(4-甲基-5-氧代-2, 5-二氫呋喃-3-基)-2, 8-二氮雜螺[4. 5]癸-1-酮; 8-[(2R)-2-甲氧基-2-(4-甲基-1-氧代-1,3-二氫-2-苯并呋喃-5-基)乙 基]-2- (5-氧代-2, 5-二氫呋喃-3-基)-2, 8-二氮雜螺[4. 5]癸-1-酮; 1-氧代-2- (5-氧代-2, 5-二氫