The HCG-beta (123-145), with the CAS registry number 66053-67-6, is also known as L-Glutamine, L-alanyl-L-prolyl-L-prolyl-L-prolyl-L-seryl-L-leucyl-L-prolyl-L-seryl-L-prolyl-L-seryl-L-arginyl-L-leucyl-L-prolylglycyl-L-prolyl-L-seryl-L-α-aspartyl-L-threonyl-L-prolyl-L-isoleucyl-L-leucyl-L-prolyl- (9CI). This chemical's molecular formula is C₁₀₅H₁₆₉N₂₇O₃₂ and molecular weight is 2321.63. This chemical is carboxy-terminal portion of HCG beta-subunit. 

You can still convert the following datas into molecular structure:
(1)SMILES: CCC(C)C(C(=O)NC(CC(C)C)C(=O)N1CCCC1C(=O)NC(CCC(=O)N)C(=O)O)NC(=O)C2CCCN2C(=O)C(C(C)O)NC(=O)C(CC(=O)O)NC(=O)C(CO)NC(=O)C3CCCN3C(=O)CNC(=O)C4CCCN4C(=O)C(CC(C)C)NC(=O)C(CCCNC(=N)N)NC(=O)C(CO)NC(=O)C5CCCN5C(=O)C(CO)NC(=O)C6CCCN6C(=O)C(CC(C)C)NC(=O)C(CO)NC(=O)C7CCCN7C(=O)C8CCCN8C(=O)C9CCCN9C(=O)C(C)N
(2)Std. InChI: InChI=1S/C105H169N27O32/c1-11-56(8)81(95(154)117-64(46-55(6)7)99(158)126-37-15-25-71(126)90(149)113-60(104(163)164)32-33-78(107)138)122-94(153)75-29-19-41-130(75)103(162)82(58(10)137)123-84(143)61(47-80(140)141)114-86(145)66(50-134)118-89(148)70-24-13-35-124(70)79(139)48-111-88(147)69-23-14-36-125(69)97(156)62(44-53(2)3)115-83(142)59(22-12-34-110-105(108)109)112-85(144)65(49-133)119-91(150)72-26-17-39-128(72)100(159)68(52-136)121-93(152)73-27-16-38-127(73)98(157)63(45-54(4)5)116-87(146)67(51-135)120-92(151)74-28-18-40-129(74)101(160)77-31-21-43-132(77)102(161)76-30-20-42-131(76)96(155)57(9)106/h53-77,81-82,133-137H,11-52,106H2,1-10H3,(H2,107,138)(H,111,147)(H,112,144)(H,113,149)(H,114,145)(H,115,142)(H,116,146)(H,117,154)(H,118,148)(H,119,150)(H,120,151)(H,121,152)(H,122,153)(H,123,143)(H,140,141)(H,163,164)(H4,108,109,110)/t56-,57-,58+,59-,60-,61-,62-,63-,64-,65-,66-,67-,68-,69-,70-,71-,72-,73-,74-,75-,76-,77-,81-,82-/m0/s1
(3)Std. InChIKey: UQHLFCUMFKQWEV-QBBOMDFKSA-N