一人参皂苷A经酶水解后，获得一分子苷元两分子β-D-葡萄糖，苷元C经鉴定结构为20(S)-原人参二醇(20(S)-protopanaxadiol)型，化合物A、C及糖部分的碳谱数据如下：
| NO. | C | A | NO. | C | A | glc | 结合糖1 | |
| 1 | 39.2 | 39.6 | 16 | 26.8 | 26.6 | 1 | 101.2 | 104.7 |
| 2 | 28.2 | 25.6 | 17 | 54.7 | 53.6 | 2 | 74.7 | 83.3 |
| 3 | 77.9 | 89.0 | 18 | 16.2 | 16.2 | 3 | 78.1 | 77.8 |
| 4 | 39.5 | 39.6 | 19 | 15.8 | 15.9 | 4 | 71.8 | 71.8 |
| 5 | 5613 | 56.5 | 20 | 72.9 | 72.9 | 5 | 78.0 | 77.5 |
| 6 | 18.7 | 18.4 | 21 | 26.9 | 26.8 | 6 | 62.8 | 62.8 |
| 7 | 35.2 | 35.2 | 22 | 35.8 | 36.2 | |||
| 8 | 40.0 | 40.1 | 23 | 22.9 | 23.0 | 结合糖2 | ||
| 9 | 50.4 | 50.2 | 24 | 126.2 | 125.8 | 1 | 105.7 | |
| 10 | 37.3 | 37.0 | 25 | 130.6 | 130.7 | 2 | 76.4 | |
| 11 | 32.0 | 30.8 | 26 | 25.8 | 25.6 | 3 | 78.8 | |
| 12 | 70.9 | 70.6 | 27 | 17.6 | 17.8 | 4 | 71.8 | |
| 13 | 48.2 | 49.4 | 28 | 28.6 | 28.0 | 5 | 78.1 | |
| 14 | 51.6 | 51.4 | 29 | 16.5 | 16.5 | 6 | 62.8 | |
| 15 | 31.8 | 30.8 | 30 | 17.0 | 17.4 |
试回答下列问题：
(1)解释糖和苷元连接位置，并加以说明。
(2)解释糖和糖之间的连接位置，并加以说明。
(3)写出化合物A的正确结构式，糖部分用Harworth式表示，并指出糖的优势构象。
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