Chain X ( F12 X17 L18 W19 D36 F37 H38 V39 V40 R42 G48 A49 X50 T51 X53 L54 E55 C57 L58 T60 E61 R62 L64 W65 R89 X90 C91 Y92 X93 G94 R116 A117 I119 R121 X525 )