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sgg joined the group
SIG-13 Molecular Structure and Chemical Properties 9 years, 11 months ago -
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sigofficer joined the group
SIG-13 Molecular Structure and Chemical Properties 10 years ago -
president joined the group
SIG-13 Molecular Structure and Chemical Properties 10 years ago -
sig13webmaster joined the group
SIG-13 Molecular Structure and Chemical Properties 10 years ago
