S7, S8 (17) S9, S10 tert-Butyl (7) S11, S12 tert-Butyl (8) S13, S14 (20) S15, S16 (21) S17, S18 acid (22)
(17) S7, S8 tert-Butyl (7) S9, S10 tert-Butyl (8) S11, S12 (20) S13, S14 (21) S15, S16 acid (22) S17, S18
1-s2.0-S0008621518304130-mmc1.docx