(3R,13R,14S,17S,18R,19R,20S,21S,22R,24R,25S)-21-(acetyloxy)-20-[(acetyloxy)methyl]-18,25-dihydroxy-3,13,14,25-tetramethyl-6,15-dioxo-22-(propionyloxy)-2,5,16-trioxa-11-azapentacyclo[15.7.1.0~1,20~.0~3 Euophelline InChI=1/C47H51NO17/c1-8-31(51)61-35-32-36(62-41(54)28-16-11-9-12-17-28)47-45(7,57)37(63-40(53)25(3)24(2)33-30(20-15-21-48-33)43(56)59-22-44(32,6)65-47)34(52)38(64-42(55)29-18-13-10-14-19-29)46(47,23-58-26(4)49)39(35)60-27(5)50/h9-21,24-25,32,34-39,52,57 L-cysteine, S-(2-hydroxyethyl)-